{"id":"CVE-2026-18526","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-18526","generatedAt":"2026-10-28T04:36:23.055Z","title":"HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.","description":"HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.","published":"2026-08-19T15:16:58.000Z","lastModified":"2026-10-27T12:10:00.000Z","status":"Deferred","sourceIdentifier":"help@fluidattacks.com","cvss":{"version":"4.0","score":7.4,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/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/M"},"cwe":["CWE-79"],"affected":[],"epss":{"score":0.0046,"percentile":0.3966,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://fluidattacks.com/advisories/greeicy","source":"help@fluidattacks.com"},{"url":"https://github.com/humhub/humhub","source":"help@fluidattacks.com"},{"url":"https://github.com/humhub/humhub/pull/8373","source":"help@fluidattacks.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-18526","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}