{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16889", "assignerOrgId": "9c1820ae-fb77-4810-a8aa-ca46e7474d2f", "state": "PUBLISHED", "assignerShortName": "MON-CSIRT", "dateReserved": "2026-07-24T05:06:16.448Z", "datePublished": "2026-10-29T01:32:09.466Z", "dateUpdated": "2026-10-29T01:32:09.466Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9c1820ae-fb77-4810-a8aa-ca46e7474d2f", "shortName": "MON-CSIRT", "dateUpdated": "2026-10-29T01:32:09.466Z"}, "title": "Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-434", "description": "CWE-434 Unrestricted upload of file with dangerous type", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-592", "descriptions": [{"lang": "en", "value": "CAPEC-592 Stored XSS"}]}, {"capecId": "CAPEC-23", "descriptions": [{"lang": "en", "value": "CAPEC-23 File Content Injection"}]}], "affected": [{"vendor": "Apereo Foundation", "product": "openEQUELLA", "versions": [{"status": "affected", "version": "2019.1", "lessThan": "2026.1", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p><br>"}]}], "references": [{"url": "https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w", "tags": ["vendor-advisory"]}, {"url": "https://openequella.github.io/guides/", "tags": ["product"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 4.8, "vectorString": "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"}}], "solutions": [{"lang": "en", "value": "Update to vendor recommended versions", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Update to vendor recommended versions</p><br>"}]}], "credits": [{"lang": "en", "value": "L\u00ea Ng\u1ecdc B\u1ea3o Minh ( University of Information Technology: VNUHCM - UIT )", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.4"}}}}

{}

{}

{}

{}