{"id":"CVE-2026-71236","aliases":["EUVD-2026-53309","GHSA-c924-wcfj-cr8j"],"status":"published","title":"Grocy - Stored XSS via HTMLPurifier Output Double-Decode","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification.","severity":{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00353,"percentile":0.29224,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-08-05T10:56:28Z","modified":"2026-10-28T02:30:38Z","products":[{"vendor":"grocy","product":"grocy"},{"vendor":"grocy project","product":"grocy"}],"references":[{"url":"https://github.com/grocy/grocy","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71236","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c924-wcfj-cr8j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71236.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-71236","title":"Grocy - Stored XSS via HTMLPurifier Output Double-Decode","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification.","status":"published","published":"2026-08-05T10:56:28.138Z","modified":"2026-08-10T11:45:38.198Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:49.559463Z"}],"euvd":[{"id":"EUVD-2026-53309","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification.","status":"published","published":"2026-08-05T10:56:28Z","modified":"2026-08-10T11:45:38Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T18:02:05.732685Z"}],"ghsa":[{"id":"GHSA-c924-wcfj-cr8j","title":"Grocy's API request-body parser (controllers/Api/BaseApiController.php,...","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification. This double-decode reconstructs live HTML/script tags from the entity-encoded form that HTMLPurifier produced to neutralize them, re-introducing stored XSS across API-writable fields (products, recipes, stock, users, chores, and others) that are rendered elsewhere without re-sanitization.","status":"published","published":"2026-08-05T12:31:31Z","modified":"2026-08-05T12:31:36Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:10:06.632203Z"}],"nvd":[{"id":"CVE-2026-71236","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification.","status":"published","published":"2026-08-05T11:16:26.377Z","modified":"2026-08-26T17:13:24.8Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:35.031043Z"}],"osv":[{"id":"CVE-2026-71236","title":"Grocy - Stored XSS via HTMLPurifier Output Double-Decode","description":"Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing \u0026amp;lt;, \u0026amp;gt;, and \u0026amp;amp; back to \u003c, \u003e, and \u0026 immediately after purification.","status":"published","published":"2026-08-05T10:56:28.138Z","modified":"2026-10-28T02:30:38.594716343Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:15.164658Z"}]}}