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CVE-2026-55661— TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing stored XSS via dangerous URL schemes

Quick assessment

Affected
tinacms tinacms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tina TinaCMS是Tina组织开源的一款完全开源的无头内容管理系统，支持 Markdown 和可视化编辑，通过 GraphQL API 让开发者像查询数据库一样查询 Markdown 内容。 TinaCMS 3.9.3之前版本存在跨站脚本漏洞，该漏洞源于Slate链接/图片节点上的url字段未清理，导致包含javascript:或data:text/html URL的特制内容被渲染到href/src中并在查看时执行，可能造成编辑器及网站查看者受到存储型跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.40% · P32

Affected Version Matrix 2

VendorProduct Version RangeStatus
tinacms @tinacms/mdx < 2.1.7 affected
tinacms tinacms < 3.9.3 affected
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I. Basic Information for CVE-2026-55661

Vulnerability Information
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Vulnerability Title
TinaCMS rich-text (slatejson) rendering does not sanitize link/image URLs, allowing stored XSS via dangerous URL schemes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
TinaCMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tina TinaCMS是Tina组织开源的一款完全开源的无头内容管理系统，支持 Markdown 和可视化编辑，通过 GraphQL API 让开发者像查询数据库一样查询 Markdown 内容。 TinaCMS 3.9.3之前版本存在跨站脚本漏洞，该漏洞源于Slate链接/图片节点上的url字段未清理，导致包含javascript:或data:text/html URL的特制内容被渲染到href/src中并在查看时执行，可能造成编辑器及网站查看者受到存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinacms tinacms < 3.9.3 -
tinacms @tinacms/mdx < 2.1.7 -

II. Public POCs for CVE-2026-55661

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III. Intelligence Information for CVE-2026-55661

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Patches & Fixes for CVE-2026-55661 (1)

Vendor Advisories for CVE-2026-55661 (1)

Same Patch Batch · tinacms · 2026-07-01 · 3 CVEs total

CVE-2026-54074 7.8 HIGH @tinacms/cli: Remote Code Execution via Forestry migration — unsanitised __TINA_INTERNAL__
CVE-2026-55660 TinaCMS: Cross-origin postMessage handlers and rich-text URL-sanitization bypass enable st

IV. Related Vulnerabilities

Same product: tinacms
Same vendor: tinacms
Same weakness: CWE-79

V. Comments for CVE-2026-55661

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