simplesamlphp/saml2-legacy Known Vulnerabilities & Fixes
simplesamlphp/saml2-legacy has 2 known security vulnerabilities in Packagist (PHP). Upgrade to version 4.20.2 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 4.20.2
Upgrading to 4.20.2 or later resolves all 2 known vulnerabilities in simplesamlphp/saml2-legacy. Run: composer require simplesamlphp/saml2-legacy:^4.20.2
Is simplesamlphp/saml2-legacy in your project?
Check if you're affected and upgrade to 4.20.2 to stay secure.
Security Summary
- 3 affected version ranges have been identified across these 2 advisories.
- 100% of known issues have a published fixed version.
- Remediation: composer update simplesamlphp/saml2-legacy
Vulnerabilities
2 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed Mar 11, 2025, most recently Jul 2, 2026 (478 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2026-49283 SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass | HIGH | v4.20.0, v4.20.1, 4.6.9, v0.1.0 (+148 more) | 4.20.2, 4.19.3 |
| CVE-2025-27773 The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding | HIGH | 4.6.9, v0.1.0, v0.1.0-alpha, v0.3.0 (+140 more) | 4.17.0 |
About This Data
Vulnerability data for simplesamlphp/saml2-legacy is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related Packagist (PHP) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
Check Your Dependencies
Scan your project to check if you're using a vulnerable version of simplesamlphp/saml2-legacy.