SimpleSAMLphp SAML2 has an XXE in parsing SAML messages

published 2024-12-02 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-3495 , GHSA-pxm4-r5ph-q2m2

cvss: 8.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

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.

Patch / fix

fixed in 3 distros 1 links 1

packagist simplesamlphp/saml2 4.6.14
packagist simplesamlphp/saml2-legacy 4.6.14
simplesamlphp saml2 4.6.14, 5.0.0-alpha.18

simplesamlphp Debian 14, Debian 12 1.19.7-1+deb12u1

debian advisories DEBIAN-CVE-2024-52806

github.com/simplesamlphp/saml2@5fd4ce4 commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-12-02)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
GitHub	3.1	8.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
packagist	simplesamlphp/saml2	<4.6.14	4.6.14
packagist	simplesamlphp/saml2-legacy	<4.6.14	4.6.14

Affected products

simplesamlphp saml2

Classification

Weakness

CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary