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Critical, CVSS 9.3

SAML PHP Toolkit Vulnerability on xmlseclibs CVE-2025-66475

GHSA-5j8p-438x-rgg5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (onelogin/php-saml 4.3.1, 3.8.1, 2.21.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist onelogin/php-saml

    Affected
    < 2.21.1>= 3.0.0, < 3.8.1>= 4.0.0, < 4.3.1
    Fixed in
    3.8.1, 4.3.1, 2.21.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary There is a critical vulnerability on xmlseclibs CVE-2025-66475, a dependency of php-saml Update to the following versions of php-saml which forces the use of patched versions of xmlseclibs: - 2.21.1 - 3.8.1 - 4.3.1 Impact Signature Wrapping Vulnerabilities allows an attacker to impersonate a user.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5j8p-438x-rgg5

Agent brief

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# Patch Next advisory brief: GHSA-5j8p-438x-rgg5

Advisory: SAML PHP Toolkit Vulnerability on xmlseclibs CVE-2025-66475
IDs: GHSA-5j8p-438x-rgg5
Record: https://patchnext.com/advisories/ghsa-5j8p-438x-rgg5 (revision 1, source checked 26 Oct 2026, 14:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: onelogin/php-saml 4.3.1, 3.8.1, 2.21.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist onelogin/php-saml: affected < 2.21.1; >= 3.0.0, < 3.8.1; >= 4.0.0, < 4.3.1; fixed in 3.8.1, 4.3.1, 2.21.1

## Suggested inspection (read-only)
- Packagist onelogin/php-saml: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on onelogin/php-saml.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5j8p-438x-rgg5 (GitHub-reviewed advisory GHSA-5j8p-438x-rgg5 lists affected ranges: Packagist onelogin/php-saml >=0 =3.0.0 =4.0.0 <4.3.1)

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