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CRITICAL severity

CVE-2017-12868 — simplesamlphp

CRITICALFix: simplesamlphp/simplesamlphp@4bc6296

CVE-2017-12868 is a critical-severity (CVSS 9.8) CWE-384 vulnerability in simplesamlphp/simplesamlphp. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for simplesamlphp/simplesamlphp — see the affected versions and patch details below.

SimpleSAMLphp Session fixation issue and authentication bypass in the authcrypt module

Also known asGHSA-j96g-47x2-46hv
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.26%1.05%1.84%2.63%0.8%2.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘simplesamlphp/simplesamlphp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and earlier, when used with PHP before 5.6, allows attackers to conduct session fixation attacks or possibly bypass authentication by leveraging missing character conversions before an XOR operation.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsimplesamlphp/simplesamlphp≥ 1.14.12&&< 1.14.141.14.14composer require simplesamlphp/simplesamlphp:^1.14.14

Affected Products

1 product · 1 configurations
Application
simplesamlphpsimplesamlphp
≤ 1.14.13
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAM…

twitter.comAPINov 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for simplesamlphp/simplesamlphp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update simplesamlphp/simplesamlphp to 1.14.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-12868 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and earlier, when used with PHP before 5.6, allows attackers to conduct session fixation attacks or possibly bypass authentication by leveraging missing character conversions before an XOR operation.
O3 Security · Impact-Aware SCA

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CVE-2017-12868: simplesamlphp — Fixed in 1.14.14