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High

SimpleSAMLphp Improper Verification of Cryptographic Signature

  • Disclosed: 13.05.2022
  • Updated: 11.10.2026 10:22

The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package simplesamlphp/saml2 < 1.10.5, >= 2.0, < 2.3.7, >= 3.0, < 3.1.3 1.10.5, 2.3.7, 3.1.3

References

CVSS score 7.5/10
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE)
CWE-347
Platform
Composer
Package
simplesamlphp/saml2
Disclosed
13.05.2022
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-923w-2xv2-7pr8 - CC BY 4.0

Vulnerability history: simplesamlphp/saml2

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 (9) in the archive
Total entries
9
First → latest
05.2022 07.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 7
  • Medium 1

Disclosures per year

Severity:
  1. SimpleSAMLphp has Possible DoS via XPath Transform
    High · 7.5 CVE-2026-49289 >= 4.20.0, < 4.20.3, < 4.19.3 4.20.3, 4.19.3
  2. SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass
    High · 8.7 CVE-2026-49283 >= 6.0.0, < 6.2.1, >= 5.0.0, < 5.0.6, >= 4.20.0, < 4.20.2, < 4.19.3 6.2.1, 5.0.6, 4.20.2, 4.19.3
  3. The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding
    High · 8.6 CVE-2025-27773 < 4.17.0, >= 5.0.0-alpha.1, < 5.0.0-alpha.20 4.17.0, 5.0.0-alpha.20
  4. Validation of SignedInfo
    High · 7.5 CVE-2023-49087 >= 5.0.0-alpha.12, < 5.0.0-alpha.13 5.0.0-alpha.13
  5. SimpleSAMLphp SAML2 spoof SAML responses
    Critical · 9.1 CVE-2016-9814 >= 1.10, < 1.10.3, < 1.8.1, >= 1.9.0, < 1.9.1, >= 2.0, < 2.3.3 1.10.3, 1.8.1, 1.9.1, 2.3.3
  6. SimpleSAMLphp saml2 incorrect signature validation
    High · 8.1 CVE-2018-7711 < 1.10.6, >= 2.0, < 2.3.8, >= 3.0, < 3.1.4 1.10.6, 2.3.8, 3.1.4
  7. SimpleSAMLphp SAML2 library Regular Expression Denial of Service vulnerability
    High · 7.5 CVE-2018-6519 < 1.10.4, >= 2.0, < 2.3.5, >= 3.0, < 3.1.1 1.10.4, 2.3.5, 3.1.1
  8. SimpleSAMLphp Improper Verification of Cryptographic Signature this entry
    High · 7.5 CVE-2018-7644 < 1.10.5, >= 2.0, < 2.3.7, >= 3.0, < 3.1.3 1.10.5, 2.3.7, 3.1.3

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