GHSA-9wrw-p9rm-r782 — onelogin/php-saml
Fix: onelogin/php-saml@949359fGHSA-9wrw-p9rm-r782 is a security vulnerability in onelogin/php-saml. A fix is available for onelogin/php-saml — see the affected versions and patch details below.
onelogin/php-saml Improper signature validation on LogoutRequest/LogoutResponse.
Real-World Exposure
onelogin/php-samlReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
In order to verify Signatures on Logoutrequests and LogoutResponses we use the verifySignature of the class XMLSecurityKey from the xmlseclibs library. That method end up calling openssl_verify() depending on the signature algorithm used.
The openssl_verify() function returns 1 when the signature was successfully verified, 0 if it failed to verify with the given key, and -1 in case an error occurs. PHP allows translating numerical values to boolean implicitly, with the following correspondences:
- 0 equals false.
- Non-zero equals true.
This means that an implicit conversion to boolean of the values returned by openssl_verify() will convert an error state, signaled by the value -1, to a successful verification of the signature (represented by the boolean true).
The LogoutRequest/LogoutResponse signature validator was performing an implicit conversion to boolean of the values returned by the verify() method, which subsequently will return the same output as openssl_verify() under most circumstances. This means an error during signature verification is treated as a successful verification by the method.
Since the signature validation of SAMLResponses were not affected, the impact of this security vulnerability is lower, but an update of the php-saml toolkit is recommended.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | onelogin/php-saml | all versions | 2.10.4composer require onelogin/php-saml:^2.10.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for onelogin/php-saml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update onelogin/php-saml to 2.10.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9wrw-p9rm-r782 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-9wrw-p9rm-r782 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-9wrw-p9rm-r782. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-9wrw-p9rm-r782 in your dependencies?
O3 Security finds GHSA-9wrw-p9rm-r782 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.