{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/writefreely/writefreely","product":"WriteFreely","source":"CNA: VulnCheck","vendor":"Musing Studio","versions":[{"lessThan":"0.17.3","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-126498","cwes":["CWE-79"],"description":"WriteFreely before 0.17.3 contains a stored cross-site scripting vulnerability that allows authenticated authors to inject HTML by supplying a malicious post slug via the CreatePost API. The raw slug is concatenated into an anchor by augmentReadingDestination() for paid-shortcode posts, executing script for RSS/Atom feed readers, newsletter recipients and ActivityPub viewers.","epss":{"date":"2026-11-13","percentile":0.14229,"score":0.00232},"exploits":[],"kev":null,"metrics":[{"score":5.1,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},{"score":5.4,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},{"score":5.1,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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":5.4,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1794625897505,"publishedAt":1794358730974,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/writefreely/writefreely/security/advisories/GHSA-cwxm-8ch5-j2vh"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/writefreely/writefreely/commit/d7231d81a914f1314a218d5e8fde6e0341391ccd"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/writefreely/writefreely/releases/tag/v0.17.3"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/writefreely/writefreely/blob/v0.17.2/postrender.go#L117-L121"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/writefreely/writefreely/blob/v0.17.2/database.go#L702-L705"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/writefreely-before-0.17.3-stored-xss-via-unsanitized-post-slug"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/writefreely/writefreely/blob/v0.17.2/database.go#L702-L705"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/writefreely/writefreely/blob/v0.17.2/postrender.go#L117-L121"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/writefreely/writefreely/commit/d7231d81a914f1314a218d5e8fde6e0341391ccd"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/writefreely/writefreely/releases/tag/v0.17.3"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/writefreely/writefreely/security/advisories/GHSA-cwxm-8ch5-j2vh"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/writefreely-before-0.17.3-stored-xss-via-unsanitized-post-slug"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/writefreely/writefreely/commit/d7231d81a914f1314a218d5e8fde6e0341391ccd"}],"revision":"315cef10b8f868921d370b91edc4941ec1a268636e366371dc7f82563a1e6fcc","sources":[{"modifiedAt":1794625897505,"name":"CNA: VulnCheck","retrievedAt":1794629318433,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126498"},{"modifiedAt":1794519366743,"name":"NVD","retrievedAt":1794529337348,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126498"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794629327395,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126498"}],"ssvc":{"assessedAt":1794625888518,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"WriteFreely before 0.17.3 Stored XSS via Unsanitized Post Slug","updatedAt":1794629327395}