CVE-2023-45818 — TinyMCE is an open source rich text editor
TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimmi
Published
2023-10-19T21:18:01.297Z
Last modified
2024-09-12T15:36:41.178Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
01What is this vulnerability?
TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the…
02Affected products
| Vendor | Product | Versions |
|---|
| tinymce | tinymce | < 5.10.8, >= 6.0.0, < 6.7.1 |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-10-19T21:18:01.297Z
- Last modified: 2024-09-12T15:36:41.178Z
09References
- github.com — https://github.com/tinymce/tinymce/security/advisories/GHSA-v65r-p3vv-jjfv
- researchgate.net — https://researchgate.net/publication/266654651_mXSS_attacks_Attacking_well-secur…
- tiny.cloud — https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes
- tiny.cloud — https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes
- www.tiny.cloud — https://www.tiny.cloud/docs/api/tinymce.html/tinymce.html.saxparser/
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