CVE-2025-52477HIGH 8.6EPSS p32.6%

CVE-2025-52477CVE-2025-52477

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.

Scoring

CVSS 3.18.6 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS0.41% probability of exploitation · percentile 32.6% · 2026-06-18T12:00:27Z
Published2025-06-26
Last modified2026-04-15

Underlying weaknesses· 1

CWE-918

References

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

1

TypeTargetConfidenceTier
WeaknessServer-Side Request Forgery (SSRF)cwe-9180%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.