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High

SimpleSAMLphp saml2 incorrect signature validation

  • Disclosed: 14.05.2022
  • Updated: 11.10.2026 10:22

HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.

Affected software

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PlatformPackageVulnerable versionsFixed in
Composer package simplesamlphp/saml2 < 1.10.6, >= 2.0, < 2.3.8, >= 3.0, < 3.1.4 1.10.6, 2.3.8, 3.1.4

References

CVSS score 8.1/10
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-347
Platform
Composer
Package
simplesamlphp/saml2
Disclosed
14.05.2022
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-g888-g2pp-82hf - 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 this entry
    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
    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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