CVE-2025-27773

unknown

Published 2025-03-11 · Modified 2025-05-09

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`1.19.7-1+deb12u2`
debian	bullseye	fixed	`1.19.0-1+deb11u2`
debian	sid	fixed	`1.19.7-2`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Packagist	simplesamlphp/saml2	`<4.17.0`	`4.17.0`
Packagist	simplesamlphp/saml2	`>=5.0.0-alpha.1,<5.0.0-alpha.20`	`5.0.0-alpha.20`
Packagist	simplesamlphp/saml2-legacy	`<4.17.0`	`4.17.0`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.