NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
🐘
🐘 Packagist
Not in CISA KEV
HIGH severity

CVE-2018-7711 — saml2

HIGHFix: simplesamlphp/saml2@4f6af7f

CVE-2018-7711 is a high-severity (CVSS 8.1) CWE-347 vulnerability in simplesamlphp/saml2. A fix is available for simplesamlphp/saml2 — see the affected versions and patch details below.

SimpleSAMLphp saml2 incorrect signature validation

Also known asGHSA-g888-g2pp-82hf
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.57%1.15%1.72%0.3%1.2%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

3 pkgs affected
🐘simplesamlphp/saml2🐘simplesamlphp/saml2🐘simplesamlphp/saml2

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

HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsimplesamlphp/saml2all versions1.10.6composer require simplesamlphp/saml2:^1.10.6
🐘Packagistsimplesamlphp/saml2≥ 2.0&&< 2.3.82.3.8composer require simplesamlphp/saml2:^2.3.8
🐘Packagistsimplesamlphp/saml2≥ 3.0&&< 3.1.43.1.4composer require simplesamlphp/saml2:^3.1.4

Affected Products

3 products · 5 configurations
OS
debian linuxdebian
1 version
7.0
Application
saml2simplesamlphp
≥ 3.0.0 && < 3.1.4
range
Application
simplesamlphpsimplesamlphp
< 1.15.4
range

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/saml2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update simplesamlphp/saml2 to 1.10.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-7711 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.
O3 Security · Impact-Aware SCA

Is CVE-2018-7711 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works
CVE-2018-7711: saml2 — Fixed in 1.10.6