CVE-2025-49342Network attack vector

Stored XSS via missing nonce validation

Published Dec 31, 2025 · Updated Dec 31, 2025

Cross-site request forgery in merzedes Custom Style 1.0 and earlier allows remote attackers to plant stored XSS through forged requests. The plugin's CSS-saving action accepts attacker-controlled content without valid nonce verification; public advisories do not identify the responsible function or parameter. Exploitation requires an administrator with an active WordPress session to open a crafted link or page, after which the stored payload executes for site visitors.

CVSS severity7.1
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in merzedes Custom Style 1.0 and earlier allows remote attackers to plant stored XSS through forged requests. The plugin's CSS-saving action accepts attacker-controlled content without valid nonce verification; public advisories do not identify the responsible function or parameter. Exploitation requires an administrator with an active WordPress session to open a crafted link or page, after which the stored payload executes for site visitors.

The record

CVE
CVE-2025-49342
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
merzedes
Product
Custom Style
Classifications
CWE-352, CAPEC-592, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 31, 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=n/a <=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

merzedes · Custom Styleversion=n/a <=1.0

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-592Stored XSS
T1189Drive-by Compromise

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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