{"id":"CVE-2026-126498","summary":"WriteFreely before 0.17.3 Stored XSS via Unsanitized Post Slug","details":"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.","aliases":["GHSA-cwxm-8ch5-j2vh"],"modified":"2026-11-11T10:47:27.226527093Z","published":"2026-11-11T00:58:50.974Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126498.json","unresolved_ranges":[{"extracted_events":[{"range":[{"fixed":"0.17.3"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]},{"extracted_events":[{"range":[{"fixed":"0.17.3"}],"source":"DESCRIPTION"}]}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126498.json"},{"type":"PACKAGE","url":"https://github.com/writefreely/writefreely"},{"type":"ARTICLE","url":"https://github.com/writefreely/writefreely/blob/v0.17.2/database.go#L702-L705"},{"type":"ARTICLE","url":"https://github.com/writefreely/writefreely/blob/v0.17.2/postrender.go#L117-L121"},{"type":"FIX","url":"https://github.com/writefreely/writefreely/commit/d7231d81a914f1314a218d5e8fde6e0341391ccd"},{"type":"ADVISORY","url":"https://github.com/writefreely/writefreely/releases/tag/v0.17.3"},{"type":"ADVISORY","url":"https://github.com/writefreely/writefreely/security/advisories/GHSA-cwxm-8ch5-j2vh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126498"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/writefreely-before-0.17.3-stored-xss-via-unsanitized-post-slug"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/writefreely/writefreely","events":[{"introduced":"0"},{"fixed":"d7231d81a914f1314a218d5e8fde6e0341391ccd"},{"fixed":"d2485910010b1671a6e4341ab36cd199b7868e8d"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"d7231d81a914f1314a218d5e8fde6e0341391ccd"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v0.17.3","range":[{"fixed":"d2485910010b1671a6e4341ab36cd199b7868e8d"}],"source":"REFERENCES_TAG"}]}}],"versions":["v0.17.2","v0.17.1","v0.17.0","v0.16.0","v0.15.0","v0.14.0","v0.13.2","v0.13.1","v0.13.0","v0.13.0rc1","v0.11.2","v0.12.0","v0.12.0rc1","v0.11.1","v0.11.0","v0.10.0","v0.9.1","v0.9.0","v0.6.0","v0.7.1","v0.7.0","v0.5.0","v0.4.0","v0.3.0","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126498.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"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"}]}