CVE-2016-9955 json
Incorrect signature verification in SimpleSAMLphp
published 2017-02-16 9 y ago modified 2026-06-17 4 mo ago also GHSA-p9cm-r7jg-8q3g , EUVD-2020-0272
- cvss
- 6.3
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
The SimpleSAML_XML_Validator class constructor in SimpleSAMLphp before 1.14.11 might allow remote attackers to spoof signatures on SAML 1 responses or possibly cause a denial of service (memory consumption) by leveraging improper conversion of return values to boolean.
Patch / fix
- packagist simplesamlphp/simplesamlphp 1.14.11
- simplesamlphp simplesamlphp 1.14.11
- simplesamlphp Debian 14, Debian 12 1.14.11-1
debian advisories DEBIAN-CVE-2016-9955
Exploit prediction
1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 6.3 | CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H |
| NVD | 2.0 | 4.0 | AV:N/AC:H/Au:N/C:N/I:P/A:P |
| GitHub | 3.0 | 6.3 | CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | simplesamlphp/simplesamlphp | <1.14.11 |
1.14.11 |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
simplesamlphp.org
/security/201612-02
web, vendor-advisory
-
securityfocus.com
/bid/94946
vdb-entry, web, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2018/03/msg00001.html
mailing-list, web, third-party-advisory
-
github.com
/simplesamlphp/simplesamlphp/security/advisories/GHSA-p9cm-r7jg-8q3g
web
-
nvd.nist.gov
/vuln/detail/CVE-2016-9955
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2016-9955.yaml
web
Sources
- CVE List CVE-2016-9955
- GitHub Advisory GHSA-p9cm-r7jg-8q3g
- NVD CVE-2016-9955
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.