Vulnerability-Lookup

GHSA-G82G-M9VX-VHJG

Vulnerability from github – Published: 2026-04-15 19:46 – Updated: 2026-04-15 19:46

Summary

Kimai has Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget

Details

Summary

The client-side escapeForHtml() function in KimaiEscape.js, introduced in commit 89bfa82c (#2959) to fix a JavaScript XSS vulnerability, only escapes <, >, 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.

Details

Incomplete security patch. The escapeForHtml() function was meant to prevent XSS but missed quote characters, which are critical for HTML attribute context escaping.

Vulnerable code — assets/js/plugins/KimaiEscape.js:29-33:

const tagsToReplace = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    // MISSING: '"': '&quot;'
    // MISSING: "'": '&#039;'
};

Affected code files: - assets/js/plugins/KimaiEscape.js:24-38 — incomplete escape function - assets/js/forms/KimaiTeamForm.js:77,86 — replacement + innerHTML - templates/macros/widgets.html.twig:126 — title="{{ tooltip }}" in avatar macro - templates/form/blocks.html.twig:104 — {{ widgets.avatar('__INITIALS__', '__COLOR__', '__DISPLAY__') }}

PoC

poc.zip

Please extract the uploaded compressed file before proceeding

./setup.sh
./poc_xss.sh

스크린샷 2026-04-07 오후 9 06 27

Impact

Stored XSS: payload persists in the database (user alias field)
Privilege escalation: ROLE_USER injects XSS that executes in ROLE_ADMIN/ROLE_SUPER_ADMIN browser session

Severity ?

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "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"
}

CVE-2026-40479 (GCVE-0-2026-40479)

Vulnerability from cvelistv5 – Published: 2026-04-17 22:31 – Updated: 2026-04-20 16:16

Title

Kimai: Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget

Summary

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's 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.

Severity ?

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/kimai/kimai/security/advisorie…	x_refsource_CONFIRM
	https://github.com/kimai/kimai/releases/tag/2.53.0	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	kimai	kimai	Affected: >= 1.16.3, < 2.53.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40479",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T16:09:41.078275Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-20T16:16:41.880Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kimai",
          "vendor": "kimai",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.16.3, \u003c 2.53.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-17T22:31:29.930Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg"
        },
        {
          "name": "https://github.com/kimai/kimai/releases/tag/2.53.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kimai/kimai/releases/tag/2.53.0"
        }
      ],
      "source": {
        "advisory": "GHSA-g82g-m9vx-vhjg",
        "discovery": "UNKNOWN"
      },
      "title": "Kimai: Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40479",
    "datePublished": "2026-04-17T22:31:29.930Z",
    "dateReserved": "2026-04-13T19:50:42.113Z",
    "dateUpdated": "2026-04-20T16:16:41.880Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-G82G-M9VX-VHJG

Summary

Details

PoC

Impact

CVE-2026-40479 (GCVE-0-2026-40479)

Tags

Sightings

Nomenclature