GHSA-h58c-xccx-75m3: Coder Stored HTML Injection Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-h58c-xccx-75m3",
  "modified" : "2026-08-20T18:34:26Z",
  "published" : "2026-08-20T18:34:26Z",
  "aliases" : [ ],
  "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!",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/coder/coder/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.34.0"
      }, {
        "fixed" : "2.34.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/coder/coder/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.33.0"
      }, {
        "fixed" : "2.33.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/coder/coder/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.30.0"
      }, {
        "fixed" : "2.32.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/coder/coder/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.29.17"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-20T18:34:26Z",
    "nvd_published_at" : null
  }
}