Automatic.css 4.0.0 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15273
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-26 03:17:08 UTC
Updated2026-09-28 15:16:04 UTC
DescriptionThe Automatic.css plugin for WordPress is vulnerable to Stored Cross-Site Scripting via REQUEST_URI in all version 4.0.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that will execute whenever an administrator accesses the Activity Log settings page.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.002150000 probability, percentile 0.107410000 (date 2026-09-29)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Automatic.css Automatic.css affected 4.0.0 Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/UI/Settings_Page/Ac... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/07d697c5-1c15-4d3a-8637-cc4fd... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Helpers/Logger.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Plugin.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Lib/WideEvents/Form... [email protected] plugins.trac.wordpress.org
automaticcss.com/changelogs [email protected] automaticcss.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Nguyen Ngoc Duc (duc193) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-31T19:07:37.000ZVendor Notified
CNA2026-09-25T14:07:53.000ZDisclosed

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