Is tinacms affected by CVE-2026-55661?

npm tinacms is affected in <3.9.3.

Is CVE-2026-55661 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

medium

CVE-2026-55661

Q: Is CVE-2026-55661 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

npm · tinacms • npm · @tinacms/mdx

Summary

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

Severity: medium
EPSS: 0.4% (p34)
Also known as: GHSA-2vcc-5v34-9jc8#@tinacms/mdx, GHSA-2vcc-5v34-9jc8#tinacms
Published: 2026-06-18

References

https://github.com/tinacms/tinacms/security/advisories/GHSA-2vcc-5v34-9jc8
https://github.com/tinacms/tinacms/pull/7056
https://github.com/tinacms/tinacms

Related advisories

CVE-2026-108261 — critical · npm/tinacms

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.