{"id":"GHSA-g82g-m9vx-vhjg","summary":"Kimai has Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget","details":"### Summary\nThe client-side `escapeForHtml()` function in `KimaiEscape.js`, introduced in commit `89bfa82c` (#2959) to fix a JavaScript XSS vulnerability, only escapes `\u003c`, `\u003e`, and `&` but does not escape `\"` (double quote) or `'` (single quote). When user-controlled data (profile alias) is placed in an HTML attribute context (`title=\"__DISPLAY__\"`) via the team member form prototype and rendered through `innerHTML`, the missing quote escaping allows HTML attribute injection, resulting in Stored XSS.\n\n### Details\nIncomplete security patch. The `escapeForHtml()` function was meant to prevent XSS but missed quote characters, which are critical for HTML attribute context escaping.\n\n**Vulnerable code** — `assets/js/plugins/KimaiEscape.js:29-33`:\n```javascript\nconst tagsToReplace = {\n    '&': '&',\n    '\u003c': '<',\n    '\u003e': '>',\n    // MISSING: '\"': '"'\n    // MISSING: \"'\": '''\n};\n```\n\n**Affected code files**:\n- `assets/js/plugins/KimaiEscape.js:24-38` — incomplete escape function\n- `assets/js/forms/KimaiTeamForm.js:77,86` — replacement + innerHTML\n- `templates/macros/widgets.html.twig:126` — `title=\"{{ tooltip }}\"` in avatar macro\n- `templates/form/blocks.html.twig:104` — `{{ widgets.avatar('__INITIALS__', '__COLOR__', '__DISPLAY__') }}`\n\n### PoC\n[poc.zip](https://github.com/user-attachments/files/26537515/poc.zip)\n\nPlease extract the uploaded compressed file before proceeding\n\n1. ./setup.sh\n2. ./poc_xss.sh\n\n\u003cimg width=\"751\" height=\"155\" alt=\"스크린샷 2026-04-07 오후 9 06 27\" src=\"https://github.com/user-attachments/assets/c09a23fb-f60b-49dd-9018-8c723e35b4c4\" /\u003e\n\n### Impact\n- Stored XSS: payload persists in the database (user alias field)\n- Privilege escalation: ROLE_USER injects XSS that executes in ROLE_ADMIN/ROLE_SUPER_ADMIN browser session","aliases":["CVE-2026-40479"],"modified":"2026-05-05T16:07:09.862377Z","published":"2026-04-15T19:46:35Z","database_specific":{"nvd_published_at":"2026-04-17T23:16:12Z","cwe_ids":["CWE-79"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-04-15T19:46:35Z"},"references":[{"type":"WEB","url":"https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40479"},{"type":"WEB","url":"https://github.com/kimai/kimai/pull/2959"},{"type":"PACKAGE","url":"https://github.com/kimai/kimai"},{"type":"WEB","url":"https://github.com/kimai/kimai/releases/tag/2.53.0"}],"affected":[{"package":{"name":"kimai/kimai","ecosystem":"Packagist","purl":"pkg:composer/kimai/kimai"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.53.0"}]}],"versions":["0.1","0.2","0.3","0.4","0.5","0.6","0.6.1","0.7","0.8","0.8.1","0.9","1.0","1.0.1","1.1","1.10","1.10.1","1.10.2","1.11","1.11.1","1.12","1.13","1.14","1.14.1","1.14.2","1.14.3","1.15","1.15.1","1.15.2","1.15.3","1.15.4","1.15.5","1.15.6","1.16","1.16.1","1.16.10","1.16.2","1.16.3","1.16.4","1.16.5","1.16.6","1.16.7","1.16.8","1.16.9","1.17","1.17.1","1.18","1.18.1","1.18.2","1.19","1.19.1","1.19.2","1.19.3","1.19.4","1.19.5","1.19.6","1.19.7","1.2","1.20","1.20.1","1.20.2","1.20.3","1.20.4","1.21.0","1.22.0","1.22.1","1.23.0","1.23.1","1.24.0","1.25.0","1.26.0","1.27.0","1.28.0","1.28.1","1.29.0","1.29.1","1.3","1.30.0","1.30.1","1.30.10","1.30.11","1.30.2","1.30.3","1.30.4","1.30.5","1.30.6","1.30.7","1.30.8","1.30.9","1.4","1.4.1","1.4.2","1.5","1.6","1.6.1","1.6.2","1.7","1.8","1.9","2.0.0","2.0.0-alpha","2.0.0-beta","2.0.0-beta-2","2.0.0-beta-3","2.0.0-rc-1","2.0.1","2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.16","2.0.17","2.0.18","2.0.19","2.0.2","2.0.20","2.0.21","2.0.22","2.0.23","2.0.24","2.0.25","2.0.26","2.0.27","2.0.28","2.0.29","2.0.3","2.0.30","2.0.31","2.0.32","2.0.33","2.0.34","2.0.35","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.10.0","2.11.0","2.12.0","2.13.0","2.14.0","2.15.0","2.16.0","2.16.1","2.17.0","2.18.0","2.19.0","2.19.1","2.2.0","2.2.1","2.20.0","2.20.1","2.21.0","2.22.0","2.23.0","2.24.0","2.25.0","2.26.0","2.27.0","2.28.0","2.29.0","2.3.0","2.30.0","2.31.0","2.32.0","2.33.0","2.34.0","2.35.0","2.35.1","2.36.0","2.36.1","2.37.0","2.38.0","2.39.0","2.4.0","2.4.1","2.40.0","2.41.0","2.42.0","2.43.0","2.44.0","2.45.0","2.46.0","2.47.0","2.48.0","2.49.0","2.5.0","2.50.0","2.51.0","2.52.0","2.6.0","2.7.0","2.8.0","2.9.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-g82g-m9vx-vhjg/GHSA-g82g-m9vx-vhjg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"}]}