GHSA-g24w-373r-5pxg
HIGHUse of Insufficiently Random Values in Apereo CAS
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
org.apereo.cas:cas-server-support-simple-mfa☕org.apereo.cas:cas-server-support-oidc☕org.apereo.cas:cas-server-core-services-api☕org.apereo.cas:cas-server-support-oauth-core-api☕org.apereo.cas:cas-server-support-shell☕org.apereo.cas:cas-server-core-services-authenticationReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils for token and ID generation which makes them predictable due to RandomStringUtils PRNG's algorithm not being cryptographically strong.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apereo.cas:cas-server-support-simple-mfa | all versions | 6.1.0-RC5 |
| ☕Maven | org.apereo.cas:cas-server-support-oidc | all versions | 6.1.0-RC5 |
| ☕Maven | org.apereo.cas:cas-server-core-services-api | all versions | 6.1.0-RC5 |
| ☕Maven | org.apereo.cas:cas-server-support-oauth-core-api | all versions | 6.1.0-RC5 |
| ☕Maven | org.apereo.cas:cas-server-support-shell | all versions | 6.1.0-RC5 |
| ☕Maven | org.apereo.cas:cas-server-core-services-authentication | all versions | 6.1.0-RC5 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes u…
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes u…
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes u…
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes u…
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes u…
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apereo.cas:cas-server-support-simple-mfa. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update org.apereo.cas:cas-server-support-simple-mfa to 6.1.0-RC5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-g24w-373r-5pxg is resolved across your whole dependency graph.
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.
How O3 protects you
O3 pinpoints whether GHSA-g24w-373r-5pxg is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-g24w-373r-5pxg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-g24w-373r-5pxg in your dependencies?
O3 detects GHSA-g24w-373r-5pxg across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.