GHSA-h58c-xccx-75m3 Coder: Stored HTML injection via unescaped ApplicationName and LogoURL appearance settings

• Go github.com/coder/coder/v2: >= 2.34.0, < 2.34.2 → fixed in 2.34.2 • Go github.com/coder/coder/v2: >= 2.33.0, < 2.33.8 → fixed in 2.33.8 • Go github.com/coder/coder/v2: >= 2.30.0, < 2.32.7 → fixed in 2.32.7 • Go github.com/coder/coder/v2: < 2.29.17 → fixed in 2.29.17

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 the `Owner` role 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!