CVE-2025-52477
Octo-STS Vulnerable to Unauthenticated SSRF with HTTP Response Reflection in OIDC Flow
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Octo-STS Vulnerable to Unauthenticated SSRF with HTTP Response Reflection in OIDC Flow
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.
- Record
CVE-2025-52477- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
EUVDEUVD-2025-19216
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.
- Record
EUVD-2025-19216- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-h3qp-hwvr-9xcq
Octo STS Unauthenticated SSRF by abusing fields in OpenID Connect tokens
Summary
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.
Please upgrade to v0.5.3 to resolve this issue. This version includes patch sets to sanitize input and redact logging.
Many thanks to @vicevirus for reporting this issue and for assisting with remediation review.
References
- Record
GHSA-h3qp-hwvr-9xcq- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-52477- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSV
Octo-STS Vulnerable to Unauthenticated SSRF with HTTP Response Reflection in OIDC Flow
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.
- Record
CVE-2025-52477- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSVGHSA-h3qp-hwvr-9xcq
Octo STS Unauthenticated SSRF by abusing fields in OpenID Connect tokens
Summary
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.
Please upgrade to v0.5.3 to resolve this issue. This version includes patch sets to sanitize input and redact logging.
Many thanks to @vicevirus for reporting this issue and for assisting with remediation review.
References
- Record
GHSA-h3qp-hwvr-9xcq- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSVGO-2025-3779 No score
Octo STS Unauthenticated SSRF by abusing fields in OpenID Connect tokens in github.com/octo-sts/app
Octo STS Unauthenticated SSRF by abusing fields in OpenID Connect tokens in github.com/octo-sts/app
- Record
GO-2025-3779- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:15405-1 No score
govulncheck-vulndb-0.0.20250730T213748-1.1 on GA media
These are all security issues fixed in the govulncheck-vulndb-0.0.20250730T213748-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:15405-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/octo-sts/appGo |
through 0.5.2 | 0.5.3 |
github.com/octo-sts/appGo |
before 0.5.3 | 0.5.3 |
govulncheck-vulndbopenSUSE:Tumbleweed From an advisory covering 56 CVEs |
before 0.0.20250730T213748-1.1 | 0.0.20250730T213748-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-52477 is a high vulnerability (CVSS 8.6) in Octo-sts App, published June 26, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.49%, the 42nd percentile. Fixed in github.com/octo-sts/app 0.5.3.
References
github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
nvd.nist.gov/vuln/detail/CVE-2025-52477
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suse.com/security/cve/CVE-2024-44905