CVE-2025-52477

Octo-STS Vulnerable to Unauthenticated SSRF with HTTP Response Reflection in OIDC Flow

Description

Octo-STS is a GitHub App that acts like a Security Token Service (STS) for the GitHub API. 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. Upgrade to v0.5.3 to resolve this issue. This version includes patch sets to sanitize input and redact logging.

Category

8.6
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.03%
Affected: octo-sts app
Published at:
Updated at:

References

Link Tags
https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
https://github.com/octo-sts/app/commit/0f177fde54f9318e33f0bba6abaea9463a7c3afd
https://github.com/octo-sts/app/commit/b3976e39bd8c8c217c0670747d34a4499043da92

Frequently Asked Questions

What is the severity of CVE-2025-52477?
CVE-2025-52477 has been scored as a high severity vulnerability.
How to fix CVE-2025-52477?
To fix CVE-2025-52477, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-52477 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-52477 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-52477?
CVE-2025-52477 affects octo-sts app.
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