# CVE-2025-27773: simplesamlphp: The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality

CVE-2025-27773 is fixed in simplesamlphp on 1 platform, first by simplesamlphp 1.15.3-1ubuntu0.1~esm1, released March 11, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-27773
- Priority: High
- CVSS: 8.6 (Medium)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | simplesamlphp Debian 11.6 (bullseye) | 1.19.0-1+deb11u2 | [DLA-4161-1](https://patchblox.com/security/data/fix/linux/dla-4161-1.md) | May 9, 2025 |
| Linux | simplesamlphp Debian 12.15 (bookworm) | 1.19.7-1+deb12u2 | [DEBIAN-CVE-2025-27773](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27773.md) | Mar 11, 2025 |
| Linux | simplesamlphp Debian 14 | 1.19.7-2 | [DEBIAN-CVE-2025-27773](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27773.md) | Mar 11, 2025 |
| Linux | simplesamlphp Ubuntu 18.04.6 LTS (bionic) | 1.15.3-1ubuntu0.1~esm1 | [simplesamlphp 1.15.3-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-simplesamlphp-1.15.3-1ubuntu0.1-esm1.md) | Mar 11, 2025 |
| Linux | simplesamlphp Ubuntu 20.04 LTS (focal) | 1.18.4-1ubuntu0.1~esm1 | [simplesamlphp 1.18.4-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-simplesamlphp-1.18.4-1ubuntu0.1-esm1.md) | Mar 11, 2025 |
| Linux | simplesamlphp Ubuntu 22.04.1 LTS (jammy) | 1.19.1-1.1ubuntu0.1~esm1 | [simplesamlphp 1.19.1-1.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-simplesamlphp-1.19.1-1.1ubuntu0.1-esm1.md) | Mar 11, 2025 |
| Linux | simplesamlphp Ubuntu 24.04.5 LTS (noble) | 1.19.7-1+deb12u1ubuntu0.1 | [simplesamlphp 1.19.7-1+deb12u1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-simplesamlphp-1.19.7-1-deb12u1ubuntu0.1.md) | Mar 11, 2025 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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