CVE-2023-2967Public exploitNetwork attack vector

Stored XSS via unescaped custom-style settings

Published Jul 10, 2023 · Updated May 5, 2025

Stored XSS in TinyMCE Custom Styles before 1.1.4 allows remote authenticated users with administrator privileges to execute scripts. The Title and Type Value settings accept script-bearing input, store it without sanitization, and render it without output escaping. Exploitation requires administrator access and disabled unfiltered_html, including on multisite installations, and executes the stored script when affected content is viewed.

CVSS severity4.8
Medium
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in TinyMCE Custom Styles before 1.1.4 allows remote authenticated users with administrator privileges to execute scripts. The Title and Type Value settings accept script-bearing input, store it without sanitization, and render it without output escaping. Exploitation requires administrator access and disabled unfiltered_html, including on multisite installations, and executes the stored script when affected content is viewed.

The record

CVE
CVE-2023-2967
Published
Jul 10, 2023
Updated
May 5, 2025
Vendor
Tim Reeves & David Stöckl
Product
TinyMCE Custom Styles
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Tim Reeves & David Stöckl · TinyMCE Custom Stylesversion=0 <1.1.4

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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