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.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
Patch x_refsource_misc
https://github.com/octo-sts/app/commit/0f177fde54f9318e33f0bba6abaea9463a7c3afd
Patch x_refsource_misc
https://github.com/octo-sts/app/commit/b3976e39bd8c8c217c0670747d34a4499043da92
Scores
CVSS v3
8.6
EPSS
0.0028
EPSS Percentile
51.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-918
Status
published
Products (2)
octo-sts/app
0 - 0.5.3Go
octo-sts/app
< 0.5.3
Published
Jun 26, 2025
Tracked Since
Feb 18, 2026