Vulnerability details
CVE-2026-32600
simplesamlphp xml-security
xml-security is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption
CVSS 3.1
8.2High
Official description
xml-security is a library that implements XML signatures and encryption. Prior to versions 2.3.1 and 1.13.9, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker can use this to brute-force an authentication tag, recover the GHASH key, and decrypt the encrypted nodes. It also allows to forge arbitrary ciphertexts without knowing the encryption key. This vulnerability is fixed in 2.3.1 and 1.13.9.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| simplesamlphp | xml-security | < 1.13.9 | CVEProject cvelistV5 (CNA) |
| simplesamlphp | xml-security | >= 2.0.0, < 2.3.1 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-4845-pr5p x_refsource_CONFIRM
- https://github.com/simplesamlphp/xml-security/commit/cad6d57cf0a5a0b7e0cc4e4a5b18752e56eb1520 x_refsource_MISC
- https://github.com/simplesamlphp/xml-security/commit/fdc12449e959c610943f9fd428e95e3832d74c25 x_refsource_MISC
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Details
- Published
- 2026-03-13
- Last updated
- 2026-03-16
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.15%
Probability of exploitation in 30 days
4.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-354Improper Validation of Integrity Check Value