Open Redirect in simplesamlphp/simplesamlphp-module-casserver (CVE-2025-65954)
Summary
Vulnerability in simplesamlphp/simplesamlphp-module-casserver (CVE-2025-65954). Risk of unauthorized operations or information disclosure. Exploitable via url. Mitigation: upgrade to 6.3.1 or later.
Original description
The description as published by the source.
Summary
The logout endpoint accepts a url query parameter to redirect to. casserver treats that url as trusted, and either (depending on configuration) redirects the browser there, or shows a "you've been logged out" page with a link to continue to that url.
There are a number of other things broken with logout in 7 (cas v3 uses a different query parameters, etc)
Details
Previous module checked the url against the valid service urls.
PoC
The docker instructions from the README.md run an image with a vulnerable config.
Accessing https://localhost/cas/logout?url=https://google.com will redirect to Google
Impact
Impacted configs have
'enable_logout' => true,
and are most impacted if they also have
'skip_logout_page' -> true,
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-65954 has been found in simplesamlphp/simplesamlphp-module-casserver.
Attackers can target a specific entry point like url over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade simplesamlphp/simplesamlphp-module-casserver to 6.3.1 or later.
If unsure, ask your IT team or search "simplesamlphp/simplesamlphp-module-casserver CVE-2025-65954" on the vendor's site.
CVE-2025-65954 (simplesamlphp/simplesamlphp-module-casserver) — CWE-601 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: url
Patched: 6.3.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-601) exists in simplesamlphp/simplesamlphp-module-casserver. Attackers reach the vulnerable code path via url without authentication.
Check the vendor advisory for the affected versions of simplesamlphp/simplesamlphp-module-casserver. Attack surface: url.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to 6.3.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'simplesamlphp/simplesamlphp-module-casserver' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'simplesamlphp/simplesamlphp-module-casserver' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
simplesamlphp/simplesamlphp-module-casserverを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade simplesamlphp/simplesamlphp-module-casserver to 6.3.1ステージング環境で 6.3.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- exploit github.com
- package github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web github.com
- web github.com