SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a s...
High-risk advisory
CVE-2026-49284
Summary
SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
Why it matters
GitHub has published a reviewed security advisory for simplesamlphp/simplesamlphp. Prioritize it with other application dependency updates.
Operator check
Check whether simplesamlphp/simplesamlphp is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.