CVE-2025-0450Network attack vector

Stored XSS via unescaped custom JavaScript attributes

Published Jan 21, 2025 · Updated Apr 8, 2026

Stored XSS in Muffin Group BeTheme 27.6.1 and earlier allows remote authenticated users to inject scripts through custom JavaScript. The custom JavaScript feature accepts contributor-supplied attributes without sufficient input sanitization and emits them into page output without context-appropriate escaping. Contributor-level access is required; the stored payload executes in each visitor's browser when an affected page is viewed, allowing script actions in that visitor's session.

CVSS severity6.4
Medium
EPSS probability0.24%
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 Muffin Group BeTheme 27.6.1 and earlier allows remote authenticated users to inject scripts through custom JavaScript. The custom JavaScript feature accepts contributor-supplied attributes without sufficient input sanitization and emits them into page output without context-appropriate escaping. Contributor-level access is required; the stored payload executes in each visitor's browser when an affected page is viewed, allowing script actions in that visitor's session.

The record

CVE
CVE-2025-0450
Published
Jan 21, 2025
Updated
Apr 8, 2026
Vendor
Muffin Group
Product
BeTheme
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=0 <=27.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Muffin Group · BeThemeversion=0 <=27.6.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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')
T1059.007JavaScript/JScript

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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