CVE-2023-2967: TinyMCE Custom Styles < 1.1.4 - Admin+ Stored Cross-Site Scripting

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-07-10 · updated 2026-06-17

Description

The TinyMCE Custom Styles WordPress plugin before 1.1.4 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affected products

TinyMCE Custom Styles: before 1.1.4 — fixed in 1.1.4

How to fix

Upgrade to a fixed version: TinyMCE Custom Styles 1.1.4. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/9afec4aa-1210-4c40-b566-64e37acf2b64
https://wpscan.com/vulnerability/9afec4aa-1210-4c40-b566-64e37acf2b64

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