{"id":"GHSA-h58c-xccx-75m3","aliases":[],"url":"https://o3.security/vulnerability/GHSA-h58c-xccx-75m3","summary":"Coder: Stored HTML injection via unescaped ApplicationName and LogoURL appearance settings","details":"### Summary\n\nThe `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.\n\n> **Note:** Exploitation requires the `Owner` role which already holds full administrative control of the deployment so practical impact is limited.\n\n### Impact\n\nAn 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.\n\n### Patches\n\nThe fix escapes the `ApplicationName` and `LogoURL` appearance values in HTML output before rendering.\n\nThe fix was backported to all supported release lines:\n\n| Release line | Patched version |\n|---|---|\n| 2.34 | [v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2) |\n| 2.33 | [v2.33.8](https://github.com/coder/coder/releases/tag/v2.33.8) |\n| 2.32 | [v2.32.7](https://github.com/coder/coder/releases/tag/v2.32.7) |\n| 2.29 (ESR) | [v2.29.17](https://github.com/coder/coder/releases/tag/v2.29.17) |\n\n### Workarounds\n\nRestrict the `Owner` role to trusted administrators.\n\n### References\n\n- Fix: #25804\n\n### Credits\n\nWe'd like to thank Anthropic's Security Team (ANT-2026-22453) for independently disclosing this issue!","published":"2026-08-20T18:34:26Z","modified":"2026-08-20T18:45:14.744376490Z","cvss":{"score":3.4,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/coder/coder/v2","fixedVersion":"2.34.2"},{"ecosystem":"Go","name":"github.com/coder/coder/v2","fixedVersion":"2.33.8"},{"ecosystem":"Go","name":"github.com/coder/coder/v2","fixedVersion":"2.32.7"},{"ecosystem":"Go","name":"github.com/coder/coder/v2","fixedVersion":"2.29.17"}],"fix":{"url":"https://github.com/coder/coder/pull/25804","label":"coder/coder#25804"},"references":[{"type":"WEB","url":"https://github.com/coder/coder/security/advisories/GHSA-h58c-xccx-75m3"},{"type":"WEB","url":"https://github.com/coder/coder/pull/25804"},{"type":"WEB","url":"https://github.com/coder/coder/commit/ec19bc41d80568c0eb9f74b526e8cc8ffbe3be9a"},{"type":"PACKAGE","url":"https://github.com/coder/coder"},{"type":"WEB","url":"https://github.com/coder/coder/releases/tag/v2.29.17"},{"type":"WEB","url":"https://github.com/coder/coder/releases/tag/v2.32.7"},{"type":"WEB","url":"https://github.com/coder/coder/releases/tag/v2.33.8"},{"type":"WEB","url":"https://github.com/coder/coder/releases/tag/v2.34.2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-20T18:45:14.744376490Z"}}