{"id":"CVE-2026-16889","aliases":[],"cve":{"records":[{"id":"CVE-2026-16889","source":"MON-CSIRT","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-24T05:06:16.448Z","published":"2026-10-29T01:32:09.466Z","modified":"2026-10-29T02:02:13.700Z"}],"publishers":[{"name":"MON-CSIRT","role":"CNA","organizationId":"9c1820ae-fb77-4810-a8aa-ca46e7474d2f","modified":"2026-10-29T01:32:09.466Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T02:02:13.700Z"}],"references":[{"url":"https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w","tags":["vendor-advisory"],"source":"MON-CSIRT"},{"url":"https://openequella.github.io/guides/","tags":["product"],"source":"MON-CSIRT"}],"weaknesses":[{"id":"CWE-434","description":"CWE-434 Unrestricted upload of file with dangerous type","source":"MON-CSIRT"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T01:51:03.808908Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin","titleSource":"MON-CSIRT","descriptionSource":"MON-CSIRT","description":"In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.","score":4.8,"severity":"medium","published":"2026-10-29T01:32:09.466Z","modified":"2026-10-29T02:02:13.700Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Apereo Foundation","name":"openEQUELLA","platforms":[],"versions":[{"version":"2019.1","status":"affected","lessThan":"2026.1","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"MON-CSIRT","url":"https://www.cve.org/CVERecord?id=CVE-2026-16889"}],"remediation":[{"text":"Update to vendor recommended versions","source":"MON-CSIRT","url":"https://www.cve.org/CVERecord?id=CVE-2026-16889"}],"references":["https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w","https://openequella.github.io/guides/"],"sources":[{"name":"CVE","id":"CVE-2026-16889","modified":"2026-10-29T02:02:13.700Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-16889"}],"assessments":[{"source":"MON-CSIRT","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":4.8}],"sourceAffected":[],"observedAt":"2026-10-29T14:37:48.394Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T14:00:31.626Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T08:40:35.392Z","attemptedAt":"2026-10-29T08:40:35.392Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T08:40:35.392Z","attemptedAt":"2026-10-29T08:40:35.392Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T08:40:34.235Z","attemptedAt":"2026-10-29T08:40:34.235Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-29T08:40:34.233Z","attemptedAt":"2026-10-29T08:40:34.233Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-112563","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112563","modified":"Oct 29, 2026, 2:02:13 AM","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","checkedAt":"2026-10-29T08:40:34.235Z"},{"source":"GitHub Advisory Database","id":"GHSA-jj9r-xgj6-prvj","url":"https://github.com/advisories/GHSA-jj9r-xgj6-prvj","modified":"2026-10-29T03:30:37Z","checkedAt":"2026-10-29T08:40:35.392Z"},{"source":"NVD","id":"CVE-2026-16889","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16889","modified":"2026-10-29T04:18:35.640","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-29T08:40:35.392Z"}],"aiSummary":{"text":"openEQUELLA before 2026.1 allows stored cross-site scripting via pre-login notice image upload. A user with EDIT_SYSTEM_SETTINGS permission can upload an HTML file served as text/html. Unauthenticated exploitation is possible if the guest user or everyone has this permission.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:39:41.748Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-16889"}]}}