{"id":"CVE-2026-41661","state":"PUBLISHED","title":"Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion","description":"Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msg_window.php. The endpoint passes user input through htmlspecialchars(), which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholders() converts those brackets into HTML angle brackets, producing executable markup. This issue has been patched in version 5.0.9.","publishedAt":"2026-05-07T02:59:34.649Z","updatedAt":"2026-05-07T14:58:41.314Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["Admidio admidio"],"affected":[{"vendor":"Admidio","product":"admidio","versions":[{"version":"< 5.0.9","status":"affected"}]}],"references":["https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp","https://github.com/Admidio/admidio/releases/tag/v5.0.9"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/41xxx/CVE-2026-41661.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-41661","state":"PUBLISHED","datePublished":"2026-05-07T02:59:34.649Z","dateUpdated":"2026-05-07T14:58:41.314Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-21T23:58:43.803Z"},"containers":{"cna":{"title":"Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion","descriptions":[{"lang":"en","value":"Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msg_window.php. The endpoint passes user input through htmlspecialchars(), which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholders() converts those brackets into HTML angle brackets, producing executable markup. This issue has been patched in version 5.0.9."}],"affected":[{"vendor":"Admidio","product":"admidio","versions":[{"version":"< 5.0.9","status":"affected"}]}],"references":[{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp","name":"https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.9","name":"https://github.com/Admidio/admidio/releases/tag/v5.0.9","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-07T02:59:34.649Z"},"source":{"advisory":"GHSA-gq27-fc8w-vcmp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-07T13:55:38.338518Z","id":"CVE-2026-41661","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-07T14:58:41.314Z"}}]}}}