{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"buku","product":"buku","source":"CNA: VulnCheck","vendor":"jarun","versions":[{"lessThanOrEqual":"5.1.1","status":"affected","version":"5.0","versionType":"custom"}]}],"cveId":"CVE-2026-121627","cwes":["CWE-79"],"description":"buku 5.0 through 5.1.1 contains a stored cross-site scripting vulnerability in the bukuserver bookmark list that allows attackers to execute script via an unescaped bookmark URL in BookmarkModelView._list_entry(). Attackers can submit a URL containing a double quote and event handler through the unauthenticated /api/bookmarks endpoint to issue same-origin API requests with viewers' credentials.","epss":{"date":"2026-11-09","percentile":0.09102,"score":0.00194},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},{"score":6.1,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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","version":"4.0"},{"score":6.1,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1794237971341,"publishedAt":1793726033952,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/jarun/buku/issues/911"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/jarun/buku"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-url"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/issues/911"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-url"}],"remediation":[],"revision":"1f2f5e68fac52dd486850ecc20ba347b05dc5db5edbba41bc4e8bc469eaacd56","sources":[{"modifiedAt":1794237971341,"name":"CNA: VulnCheck","retrievedAt":1794240581761,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121627"},{"modifiedAt":1793729878790,"name":"NVD","retrievedAt":1793751687752,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121627"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794240588883,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-121627"}],"ssvc":{"assessedAt":1794237946592,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"buku 5.0 through 5.1.1 Stored XSS via bukuserver Bookmark List URL","updatedAt":1794240588883}