CVE-2026-55661: medium-severity vulnerability in tinacms
TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing stored XSS via dangerous URL schemes
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.8epss 0.4%
Tina is a headless content management system. In versions prior to @tinacms/mdx 2.1.7 and tinacms 3.9.3, rich-text parsing and the default link/image renderers did not sanitize the url field on Slate link/image nodes. Content containing javascript: or data:text/html URLs — including case-variant, whitespace-padded, and control-character-obfuscated forms — is rendered into href/src and executes when the content is viewed. Any actor able to author rich-text content (for example a lower-privileged editor, or imported/external content) can achieve stored XSS against editors and site viewers. This issue is fixed in versions @tinacms/mdx 2.1.7 and tinacms 3.9.3.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Related CVEs — tinacms
In the same product, most dangerous first.
CVE-2023-25164HIGHSensitive Information leak via Script File in TinaCMSEPSS 0.7%CVE-2026-63506HIGHTina: [Broken Access Control] letting any TinaCloud user authorize against any self-hosted siteEPSS 0.5%CVE-2025-68278HIGHtinacms vulnerable to arbitrary code executionEPSS 0.5%CVE-2026-34603HIGH@tinacms/graphql's Media Endpoints Can Escape the Media Root via Symlinks or JunctionsEPSS 0.4%CVE-2026-33949HIGH@tinacms/graphql has Path Traversal that leads to overwrite of arbitrary filesEPSS 0.4%CVE-2026-59992MEDIUMTina: Broken Access Control: arbitrary bucket-key write/delete in `next-tinacms-s3` (and sibling production media adapters)EPSS 0.4%