CVE-2026-2027Network attack vector

Stored XSS via unescaped AMP Custom CSS

Published Feb 14, 2026 · Updated Feb 14, 2026

Stored XSS in Magazine3 AMP Enhancer 1.0.49 and earlier allows remote authenticated users to inject scripts through AMP Custom CSS. The AMP Custom CSS path stores user-supplied CSS without sufficient sanitization and emits it on AMP pages without context-appropriate output escaping. Administrator access is required, and exposure is limited to multisite installations or sites where unfiltered_html is disabled; injected scripts execute in page visitors' browsers.

CVSS severity4.4
Medium
EPSS probability0.21%
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 Magazine3 AMP Enhancer 1.0.49 and earlier allows remote authenticated users to inject scripts through AMP Custom CSS. The AMP Custom CSS path stores user-supplied CSS without sufficient sanitization and emits it on AMP pages without context-appropriate output escaping. Administrator access is required, and exposure is limited to multisite installations or sites where unfiltered_html is disabled; injected scripts execute in page visitors' browsers.

The record

CVE
CVE-2026-2027
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
Backup For WP
Product
AMP Enhancer - Compatibility Layer for Official AMP Plugin
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=* <=1.0.49

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Backup For WP · AMP Enhancer - Compatibility Layer for Official AMP Pluginversion=* <=1.0.49

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/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
Privilegesadmin
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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