SimpleSAMLphp Signature validation bypass
A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | simplesamlphp/simplesamlphp | < 1.14.17 | 1.14.17 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2017-18122
- https://github.com/simplesamlphp/simplesamlphp/commit/e2d53086abbb253efb24ddcb49b116246eb0b6ca
- https://github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2017-18122.yaml
- https://github.com/simplesamlphp/simplesamlphp
- https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
- https://simplesamlphp.org/security/201710-01
- https://www.debian.org/security/2018/dsa-4127
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-347- Platform
- Composer
- Package
simplesamlphp/simplesamlphp- Disclosed
- 14.05.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-j4qf-3w33-8cgc - CC BY 4.0
Vulnerability history: simplesamlphp/simplesamlphp
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 23
- First → latest
- 01.2020 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 4
- Medium 12
- Low 4
Disclosures per year
- 2020: 6
- 2021: 0
- 2022: 12
- 2023: 0
- 2024: 4
- 2025: 0
- 2026: 1
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SimpleSAMLphp Signature validation bypass this entry
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