XSS in Tiny Tinymce
CVE-2023-48219
TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo/redo functionality and other APIs and plugins. Text nodes within specific parents are not escaped upon serialization according to the HTML standard. If such text nodes contain a special character reserved as an internal marker, they can be combined with other HTML patterns to form malicious snippets. These snippets pass the initial sanitisation layer when the content is parsed into the editor body, but can trigger XSS when the special internal marker is removed from the content and re-parsed. his vulnerability has been patched in TinyMCE versions 6.7.3 and 5.10.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (51.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Tiny Tinymce
- Tinymce — versions >= 6.0.0 < 6.7.3, < 5.10.9
Weakness classification (CWE)
References
- github.com/tinymce/tinymce/security/advisories/GHSA-v626-r774-j7f8 (Vendor Advisory)
- tiny.cloud/docs/release-notes/release-notes5109/ (Release Notes)
- tiny.cloud/docs/tinymce/6/6.7.3-release-notes/ (Release Notes)
Frequently asked questions
- What is CVE-2023-48219?
- CVE-2023-48219 is a medium-severity vulnerability in Tiny Tinymce, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-11-15.
- How severe is CVE-2023-48219?
- Medium severity. CVSS v3 base score is 6.1 out of 10.