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CVE-2026-55661

MEDIUM
4.8
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-55661
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-17 00:05 UTC
Published
2026-07-01 20:44 UTC
Last updated
2026-07-01 20:44 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
tinacms / tinacms
Sources
cve.org  ·  NVD

Severity & Metrics

4.8 MEDIUM CVSS 4.0
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
Affected products (2)
VendorProductPlatformVersions
tinacms @tinacms/mdx — < 2.1.7
tinacms tinacms — < 3.9.3
Weakness (CWE)
CWESourceDescription
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-87 cna CWE-87: Improper Neutralization of Alternate XSS Syntax
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.8 MEDIUM 4.0 cna 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
References (2)
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