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Medium

Admidio writes session IDs and auto-login cookie values to application logs

  • Disclosed: 29.05.2026
  • Updated: 11.10.2026 10:22

Summary

When debug logging is enabled, Session::setCookie() logs full cookie values and Session::start() logs the current session ID. In a real Admidio deployment this includes both the active session cookie and the persistent auto-login cookie. Anyone with access to the log sink can recover live bearer-style credentials from the logs.

Vulnerable Code Links

Vulnerable Code

php
// src/Session/Entity/Session.php
$gLogger->info('Set Cookie!', array(
'name' => $name,
'value' => $value,
'expire' => $expire,
'path' => $path,
'domain' => $domain,
'secure' => $secure,
'httpOnly' => $httpOnly,
'sameSite' => 'lax'
));
...
session_start();
$gLogger->info('Session Started!', array(
'name' => $sessionName,
'limit' => $limit,
'path' => $path,
'domain' => $domain,
'secure' => $secure,
'httpOnly' => $httpOnly,
'sameSite' => 'lax',
'sessionId' => session_id()
));

What Does The Code Mean

Every time Admidio sets a cookie, it writes the raw cookie value to the application log. When a session starts, it writes the active session identifier too.

Why The Code Is Vulnerable

Session IDs and persistent auto-login values are credentials. Logging them turns the log file into a credential store and expands the trust boundary to anyone who can read logs, backups, or external log aggregation outputs.

Verification Environment

  • Application: Admidio v5.0.9
  • Runtime: Dockerized Admidio + MariaDB on http://localhost:18080
  • Validation mode: real deployed application, not isolated unit tests

Steps To Reproduce

  1. Enable Admidio debug logging.
  2. Log in with auto_login=1 enabled.
  3. Inspect the generated application log.
  4. Observe that the log contains both the ADMIDIO_*_AUTO_LOGIN_ID value and the ADMIDIO_*_SESSION_ID value in cleartext.

PoC Script

python
from helpers import login, new_session, save_json


def main():
session = new_session()
result = login(session, "admin", "AdminPass123!", auto_login=True)
save_json("session_logging_login.json", result)


if __name__ == "__main__":
main()

PoC Output

{
  "cookies": {
"ADMIDIO_admidio_adm_AUTO_LOGIN_ID": "2%3AnO2BhCdRgFUMKT46e2EzS79Inf4oWiLWzLnX9Ko5",
"ADMIDIO_admidio_adm_SESSION_ID": "iga3ujr67cti6s7btnuhecte67"
  },
  "csrf": "y41CaDdEO7RKug5FIRWO2Dx8w7KVQZ",
  "json": {
"status": "success",
"url": "http://localhost:18080/modules/overview.php"
  },
  "status_code": 200
}

5191:[2026-04-30 20:57:59.555213] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"8224iqk8aqcsb0062d0c3f1ish"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5291:[2026-04-30 20:57:59.575756] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"8224iqk8aqcsb0062d0c3f1ish"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5480:[2026-04-30 20:57:59.623872] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"733jf4j6po8m6b1g7glgaghfsg"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5624:[2026-04-30 20:57:59.663760] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"733jf4j6po8m6b1g7glgaghfsg"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5655:[2026-04-30 20:57:59.788831] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"ovnk3hhpj5829dj63pjk4i7k8b","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
5680:[2026-04-30 20:57:59.795443] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"ovnk3hhpj5829dj63pjk4i7k8b"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5815:[2026-04-30 20:57:59.838697] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"ovnk3hhpj5829dj63pjk4i7k8b"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5839:[2026-04-30 20:58:09.374182] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"dvrl2qf92skdeimh77ruglr4ga"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
5983:[2026-04-30 20:58:09.423217] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"dvrl2qf92skdeimh77ruglr4ga"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6014:[2026-04-30 20:58:09.550875] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"2th9qe9etfiis6nujdqpkfd9hv","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
6039:[2026-04-30 20:58:09.557823] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"2th9qe9etfiis6nujdqpkfd9hv"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6273:[2026-04-30 20:58:19.171185] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"k50i1toh4491o6v0htliv2kafs"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6417:[2026-04-30 20:58:19.212351] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"k50i1toh4491o6v0htliv2kafs"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6448:[2026-04-30 20:58:19.337758] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"4emiuth6i2fc1ho17nahf6n52g","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
6473:[2026-04-30 20:58:19.346804] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"4emiuth6i2fc1ho17nahf6n52g"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6605:[2026-04-30 20:58:19.390909] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"4emiuth6i2fc1ho17nahf6n52g"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6635:[2026-04-30 20:58:19.409216] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"4emiuth6i2fc1ho17nahf6n52g"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6676:[2026-04-30 20:58:31.002317] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"aegildsksa0i5184igdk12pdg3"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6820:[2026-04-30 20:58:31.045064] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"aegildsksa0i5184igdk12pdg3"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
6853:[2026-04-30 20:58:31.174884] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"9vsc7c5qv9cr4cavugitg6i2l3","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
6878:[2026-04-30 20:58:31.184031] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"9vsc7c5qv9cr4cavugitg6i2l3"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7010:[2026-04-30 20:58:40.393679] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"nr7mssfl6eupo9d2pboea7hmb2"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7154:[2026-04-30 20:58:40.438503] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"nr7mssfl6eupo9d2pboea7hmb2"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7185:[2026-04-30 20:58:40.564244] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"sts5aqfsvqghtl6bfq79a3ap2t","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
7210:[2026-04-30 20:58:40.571305] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"sts5aqfsvqghtl6bfq79a3ap2t"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7342:[2026-04-30 20:58:40.611506] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"sts5aqfsvqghtl6bfq79a3ap2t"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7414:[2026-04-30 21:01:44.898211] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"dcgm8ebt3hkhmvvk9n860r6i5n"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7558:[2026-04-30 21:01:44.940724] Admidio.INFO: Session Started! {"name":"ADMIDIO_admidio_adm_SESSION_ID","limit":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax","sessionId":"dcgm8ebt3hkhmvvk9n860r6i5n"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":617,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"start"}
7591:[2026-04-30 21:01:45.066694] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_AUTO_LOGIN_ID","value":"2:nO2BhCdRgFUMKT46e2EzS79Inf4oWiLWzLnX9Ko5","expire":1809118905,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}
7596:[2026-04-30 21:01:45.068352] Admidio.INFO: Set Cookie! {"name":"ADMIDIO_admidio_adm_SESSION_ID","value":"iga3ujr67cti6s7btnuhecte67","expire":0,"path":"/","domain":false,"secure":false,"httpOnly":true,"sameSite":"lax"} {"file":"/opt/app-root/src/src/Session/Entity/Session.php","line":533,"class":"Admidio\\Session\\Entity\\Session","callType":"::","function":"setCookie"}

Impact

Any actor with log access can replay or abuse current session IDs and auto-login cookies, leading to session hijacking or long-lived account access depending on deployment and cookie lifetime.

Remediation And Suggestions

Never log raw session identifiers or cookie values. Replace them with fixed labels or redact most of the value before logging.

php
$gLogger->info('Set Cookie!', [
'name' => $name,
'value' => '[redacted]',
'expire' => $expire,
'path' => $path,
'domain' => $domain,
'secure' => $secure,
'httpOnly' => $httpOnly,
'sameSite' => 'lax',
]);

$gLogger->info('Session Started!', [
'name' => $sessionName,
'limit' => $limit,
'path' => $path,
'domain' => $domain,
'secure' => $secure,
'httpOnly' => $httpOnly,
'sameSite' => 'lax',
'sessionId' => '[redacted]',
]);

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package admidio/admidio < 5.0.10 5.0.10

References

CVSS score 4.4/10
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-200, CWE-532
Platform
Composer
Package
admidio/admidio
Disclosed
29.05.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-mch8-wf3h-6x88 - CC BY 4.0

Vulnerability history: admidio/admidio

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (50) in the archive
Total entries
50
First → latest
03.2022 07.2026
Without a fix
1
Exploited in attacks
0

Severity breakdown

  • Critical 3
  • High 10
  • Medium 33
  • Low 4

Disclosures per year

Severity:
  1. Admidio writes session IDs and auto-login cookie values to application logs this entry
    Medium · 4.4 CVE-2026-47234 < 5.0.10 5.0.10
  2. Admidio has IDOR in `documents-files.php` `mode=move_save` that lets any folder-uploader exfiltrate files from private folders
    High · 8.1 CVE-2026-47231 < 5.0.10 5.0.10
  3. Admidio Sends SAML Response to Unvalidated Assertion Consumer Service URL from AuthnRequest
    High · 8.2 CVE-2026-41670 < 5.0.9 5.0.9
  4. Admidio Ignores SAML Signature Validation Result, Processes Forged AuthnRequests and LogoutRequests
    High · 8.2 CVE-2026-41669 < 5.0.9 5.0.9
  5. Admidio has Inverted 2FA Reset Authorization Check that Lets Group Leaders Strip Admin TOTP
    High · 7.1 CVE-2026-41660 < 5.0.9 5.0.9
  6. Admidio allows Unauthenticated Access to Role-Restricted documents via neutralized .htaccess
    High · 7.5 CVE-2026-34381 >= 5.0.0, < 5.0.8 5.0.8
  7. Admidio has a Second-Order SQL Injection via List Configuration (lsc_special_field, lsc_sort, lsc_filter)
    High · 8.0 CVE-2026-32813 < 5.0.7 5.0.7
  8. Admidio is Missing Authorization and CSRF Protection on Document and Folder Deletion
    Critical · 9.1 CVE-2026-32817 >= 5.0.0, < 5.0.7 5.0.7
  9. File Upload(RCE) Vulnerability in admidio
    High · 8.8 CVE-2026-32756 < 5.0.7 5.0.7
  10. Admidio Vulnerable to Authenticated SQL Injection in Member Assignment Functionality
    High · 7.2 CVE-2025-62617 < 4.3.17 4.3.17
  11. Admidio Vulnerable to RCE via Arbitrary File Upload in Message Attachment
    Critical · 9.0 CVE-2024-38529 < 4.3.10 4.3.10
  12. Admidio has Blind SQL Injection in ecard_send.php
    Critical · 9.9 CVE-2024-37906 < 4.3.9 4.3.9
  13. Admidio Improper Neutralization of Formula Elements in a CSV File vulnerability
    High · 7.3 CVE-2023-3302 < 4.2.9 4.2.9
  14. Insufficient Session Expiration in Admidio
    High · 8.2 CVE-2022-0991 < 4.1.9 4.1.9

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