GHSA-h3qp-hwvr-9xcq is a high-severity (CVSS 8.6) Server-Side Request Forgery (SSRF) vulnerability in github.com/octo-sts/app. A fix is available for github.com/octo-sts/app — see the affected versions and patch details below.
Octo STS Unauthenticated SSRF by abusing fields in OpenID Connect tokens
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-h3qp-hwvr-9xcq.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-h3qp-hwvr-9xcq by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
github.com/octo-sts/appReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
Octo-STS versions before v0.5.3 are vulnerable to unauthenticated SSRF by abusing fields in OpenID Connect tokens. Malicious tokens were shown to trigger internal network requests which could reflect error logs with sensitive information.
Please upgrade to v0.5.3 to resolve this issue. This version includes patch sets to sanitize input and redact logging.
Many thanks to @vicevirus for reporting this issue and for assisting with remediation review.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/octo-sts/app | all versions | 0.5.3go get github.com/octo-sts/app@v0.5.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/octo-sts/app, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/octo-sts/app to 0.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h3qp-hwvr-9xcq is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
Frequently Asked Questions
Is GHSA-h3qp-hwvr-9xcq in your dependencies?
Find it across Go, including transitive dependencies.