CVE-2025-27773

Publication date 11 March 2025

Last updated 15 September 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.6 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
simplesamlphp 26.04 LTS resolute
Not affected
25.10 questing Ignored end of life, was needs-triage
25.04 plucky Ignored end of life, was needs-triage
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Fixed 1.19.7-1+deb12u1ubuntu0.1
22.04 LTS jammy
Fixed 1.19.1-1.1ubuntu0.1~esm1
20.04 LTS focal
Fixed 1.18.4-1ubuntu0.1~esm1
18.04 LTS bionic
Fixed 1.15.3-1ubuntu0.1~esm1
16.04 LTS xenial
Fixed 1.14.0-1ubuntu2+esm1

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Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.6 · High

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

References

Related Ubuntu Security Notices (USN)

    • USN-8770-1
    • SimpleSAMLphp vulnerabilities
    • 15 September 2026

Other references

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