{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "kimai/kimai"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.53.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40479"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-15T19:46:35Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "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 `\u0026` but does not escape `\"` (double quote) or `\u0027` (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** \u2014 `assets/js/plugins/KimaiEscape.js:29-33`:\n```javascript\nconst tagsToReplace = {\n    \u0027\u0026\u0027: \u0027\u0026amp;\u0027,\n    \u0027\u003c\u0027: \u0027\u0026lt;\u0027,\n    \u0027\u003e\u0027: \u0027\u0026gt;\u0027,\n    // MISSING: \u0027\"\u0027: \u0027\u0026quot;\u0027\n    // MISSING: \"\u0027\": \u0027\u0026#039;\u0027\n};\n```\n\n**Affected code files**:\n- `assets/js/plugins/KimaiEscape.js:24-38` \u2014 incomplete escape function\n- `assets/js/forms/KimaiTeamForm.js:77,86` \u2014 replacement + innerHTML\n- `templates/macros/widgets.html.twig:126` \u2014 `title=\"{{ tooltip }}\"` in avatar macro\n- `templates/form/blocks.html.twig:104` \u2014 `{{ widgets.avatar(\u0027__INITIALS__\u0027, \u0027__COLOR__\u0027, \u0027__DISPLAY__\u0027) }}`\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=\"\u1109\u1173\u110f\u1173\u1105\u1175\u11ab\u1109\u1163\u11ba 2026-04-07 \u110b\u1169\u1112\u116e 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",
  "id": "GHSA-g82g-m9vx-vhjg",
  "modified": "2026-04-15T19:46:35Z",
  "published": "2026-04-15T19:46:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kimai has Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget"
}

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user\u0027s profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a malicious alias that executes JavaScript in the browser of any administrator viewing the team form, resulting in stored XSS with privilege escalation. This issue has been fixed in version 2.53.0."
    }
  ],
  "id": "CVE-2026-40479",
  "lastModified": "2026-04-17T23:16:12.317",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-17T23:16:12.317",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/releases/tag/2.53.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}