Privilege escalation in GoatCounter via /user/pref mass assignment
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Tampering
- Confidentiality · integrity · availability
- Low · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-915.
Summary
GoatCounter through 2.7.0 contains a mass assignment flaw in the userPrefSave handler, tracked as CWE-915. The handler accepts protected account fields from form-encoded requests, which lets a logged-in user with read-only access raise their own access to superuser or admin.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
GoatCounter through 2.7.0 contains a mass assignment privilege escalation vulnerability in the userPrefSave handler that allows logged-in users to modify protected account fields via form-encoded requests. Attackers with read-only access can POST user.access[all]=* and user.email_verified=true to /user/pref, bypassing readonly tags to gain superuser or admin access.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version is listed for GoatCounter.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Timeline
- 2026-10-11 Threatist record created from CVE-2026-108740
- 2026-10-11 Alias added: GHSA-4f43-5hgr-4m7r
- 2026-10-12 Priority changed: MEDIUM → LOW
- 2026-10-13 CISA SSVC decision points changed
References
Sources
- CVE-2026-108740 · CVE Program
- CVE-2026-108740 · NVD
- FIRST EPSS
- GHSA-4f43-5hgr-4m7r · GitHub Advisory Database · CC BY 4.0
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