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TI-2025-32604 Aliases CVE-2025-52477GHSA-h3qp-hwvr-9xcq

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

Priority MEDIUM 44CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00486 42nd percentileScored 2026-11-07
Fix Fixed app (octo-sts): 0.5.3github.com/octo-sts/app (Go): 0.5.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
octo-stsappbefore 0.5.30.5.3Patch availableCNA
—github.com/octo-sts/app (Go)before 0.5.30.5.3Patch availableGHSA-h3qp-hwvr-9xcq
  • app Vendorocto-sts Affected before 0.5.3 Fixed in 0.5.3 Patch available CNA
  • github.com/octo-sts/app (Go) Vendor— Affected before 0.5.3 Fixed in 0.5.3 Patch available GHSA-h3qp-hwvr-9xcq

Remediation

  • Fix · CNA app (octo-sts) Fixed in 0.5.3
  • Fix · GHSA-h3qp-hwvr-9xcq github.com/octo-sts/app (Go) Fixed in 0.5.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-52477
  2. 2026-10-03 Alias added: GHSA-h3qp-hwvr-9xcq

References

Advisory 1

Other 4

  • TI-2026-84130 Octo STS leaks trust policy details in Exchange error messages CVSS 3.1MEDIUM 5.3
  • TI-2024-22536 octo-sts allows unauthenticated attackers to cause unbounded CPU and memory usage CVSS 3.1LOW 3.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences