PT-2023-29707 · Tinymce · Tinymce

Masatokinugawa · Published 2023-10-19 · Updated 2023-10-26 · CVE-2023-45818

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions TinyMCE versions prior to 5.10.8 TinyMCE versions prior to 6.7.1

Description 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 combination of the string manipulation and reparative parsing by either the browser's native DOMParser API (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability also impacts related TinyMCE APIs and plugins, including tinymce.Editor.getContent({ format: 'raw' }), tinymce.Editor.resetContent(), and the Autosave Plugin.

Recommendations

• Upgrade to TinyMCE 5.10.8 or higher for TinyMCE 5.x.
• Upgrade to TinyMCE 6.7.1 or higher for TinyMCE 6.x.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2023-45818

GHSA-V65R-P3VV-JJFV

Affected Products

Tinymce

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45818.json · Exploit
• https://github.com/tinymce/tinymce/security/advisories/GHSA-v65r-p3vv-jjfv · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-45818 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-45818 · Security Note
• https://ubuntu.com/security/CVE-2023-45818 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-45818 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-45818 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-v65r-p3vv-jjfv · Vendor Advisory
• https://github.com/tinymce/tinymce · Note
• https://twitter.com/CVEnew/status/1715120264067912101 · Twitter Post
• https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes · Note
• https://t.me/cvenotify/59756 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1715166743675457836 · Twitter Post
• https://researchgate.net/publication/266654651_mXSS_attacks_Attacking_well-secured_web-applications_by_using_innerHTML_mutations · Note
• https://tiny.cloud/docs/api/tinymce.html/tinymce.html.saxparser · Note