CVE-2025-67850Network attack vector

Browser script execution via unsanitized equation preview

Published Feb 3, 2026 · Updated Feb 3, 2026

Stored XSS in Moodle LMS's TinyMCE equation editor allows remote authenticated users to run script in another user's browser. The tiny_equation preview path sends arithmetic-expression input to tiny_equation_filter and assigns the returned content to innerHTML without first stripping HTML tags. A user with permission to enter an equation must save crafted content, and another user must view the expression for the script to run in that viewer's session.

CVSS severity7.3
High
EPSS probability0.28%
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 Moodle LMS's TinyMCE equation editor allows remote authenticated users to run script in another user's browser. The tiny_equation preview path sends arithmetic-expression input to tiny_equation_filter and assigns the returned content to innerHTML without first stripping HTML tags. A user with permission to enter an equation must save crafted content, and another user must view the expression for the script to run in that viewer's session.

The record

CVE
CVE-2025-67850
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record 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=4.1.0 <4.1.22
  2. Affected versionversion=4.4.0 <4.4.12
  3. Affected versionversion=4.5.0 <4.5.8
  4. Affected versionversion=5.0.0 <5.0.4
  5. Affected versionversion=5.1.0 <5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=4.1.0 <4.1.22; version=4.4.0 <4.4.12; version=4.5.0 <4.5.8; version=5.0.0 <5.0.4; version=5.1.0 <5.1.1

Published CVSS scores

7.3Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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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