CVE-2026-126498

EUVD-2026-123063
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 14.24%
Common Weakness Enumeration
References
https://github.com/writefreely/writefreely/blob/v0.17.2/database.go#L702-L705
https://github.com/writefreely/writefreely/blob/v0.17.2/postrender.go#L117-L121
https://github.com/writefreely/writefreely/commit/d7231d81a914f1314a218d5e8fde6e0341391ccd
https://github.com/writefreely/writefreely/releases/tag/v0.17.3
https://github.com/writefreely/writefreely/security/advisories/GHSA-cwxm-8ch5-j2vh
https://www.vulncheck.com/advisories/writefreely-before-0.17.3-stored-xss-via-unsanitized-post-slug