@tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-108260
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 21:17:04 UTC
Updated2026-10-09 21:17:04 UTC
DescriptionTina is a headless content management system. Prior to 0.2.1, the tina-markdown element in packages/@tinacms/web-components/src/tina-markdown.js assigns a rich-text node.url value directly to an anchor href without validating the URL scheme. A content author can store a link using a script-capable scheme, and a visitor who clicks the rendered link executes attacker-controlled script in the site's origin. The script can access same-origin application data and, when the visitor is an editor or administrator, may expose credentials stored by the TinaCMS admin on that origin. This issue is fixed in version 0.2.1.

Risk And Classification

Primary CVSS: v3.1 7.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

EPSS: 0.002050000 probability, percentile 0.096100000 (date 2026-10-10)

Problem Types: CWE-79 | CWE-83 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-83 CWE-83: Improper Neutralization of Script in Attributes in a Web Page

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.6HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
3.1CNADECLARED7.6HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tinacms Tinacms affected < 3.14.0 Not specified
CNA @tinacms Web-components affected < 0.2.1 Not specified

References

ReferenceSourceLinkTags
github.com/tinacms/tinacms/security/advisories/GHSA-c42q-qvc3-j6vg [email protected] github.com
github.com/tinacms/tinacms/releases/tag/@tinacms/[email protected] [email protected] github.com
github.com/tinacms/tinacms/commit/5295e077f0d279c35686a0e481a15e33a4877e3b [email protected] github.com
github.com/tinacms/tinacms/pull/7523 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
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