PT-2026-81999 · Go · Github.Com/Coder/Coder/V2
Published
2026-08-20
·
Updated
2026-08-20
CVSS v3.1
3.4
Low
| Vector | AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N |
Summary
The
ApplicationName and LogoURL appearance settings were rendered into HTML output without sufficient escaping which let a highly privileged Owner-role user inject HTML into the Coder dashboard and SMTP notification emails.Note: Exploitation requires theOwnerrole which already holds full administrative control of the deployment so practical impact is limited.
Impact
An Owner-role user could store HTML markup in the
ApplicationName or LogoURL appearance settings that later rendered in the dashboard and in SMTP notification emails which results in stored HTML injection against other users of the deployment. Exploitation requires the highly privileged Owner role.Patches
The fix escapes the
ApplicationName and LogoURL appearance values in HTML output before rendering.The fix was backported to all supported release lines:
| Release line | Patched version |
|---|---|
| 2.34 | v2.34.2 |
| 2.33 | v2.33.8 |
| 2.32 | v2.32.7 |
| 2.29 (ESR) | v2.29.17 |
Workarounds
Restrict the
Owner role to trusted administrators.References
- Fix: #25804
Credits
We'd like to thank Anthropic's Security Team (ANT-2026-22453) for independently disclosing this issue!
Fix
Special Elements Injection
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Weakness Enumeration
Related Identifiers
Affected Products
Github.Com/Coder/Coder/V2