OpenID Connect Authentication (oidc) Typo3 extension Authentication Bypass
The authentication service of the extension does not verify the OpenID Connect authentication state from the user lookup chain. Instead, the authentication service authenticates every valid frontend user from the user lookup chain, where the frontend user field “tx_oidc” is not empty.
In scenarios, where either ext:felogin is active or where $GLOBALS['TYPO3_CONF_VARS'][‘FE’][‘checkFeUserPid’] is disabled, an attacker can login to OpenID Connect frontend user accounts by providing a valid username and any password.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | causal/oidc | < 2.1.0 | 2.1.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N/E:F/RL:O/RC:C- Weakness (CWE)
CWE-284- Platform
- Composer
- Package
causal/oidc- Disclosed
- 02.04.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hhf8-f5w9-g6vh - CC BY 4.0
Vulnerability history: causal/oidc
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 04.2024 01.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2024: 1
- 2025: 1
- 2026: 0
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OpenID Connect Authentication (oidc) Typo3 extension Authentication Bypass this entry
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