CVE-2025-52477: SSRF (CVSS 8.6)

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.

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CVSS v3.1 Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

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

Frequently Asked Questions

What is CVE-2025-52477? +

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. It has a CVSS v3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-52477? +

CVE-2025-52477 has a CVSS v3.1 score of 8.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-52477? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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