Autoptimize <= 3.1.15.1 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78471
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-02 06:16:41 UTC
Updated2026-10-03 16:16:38 UTC
DescriptionThe Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 3.1.15.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires an administrator to have enabled Autoptimize's 'Lazy-load images?' option, the w3-total-cache/w3-total-cache.php file to be present on disk with the plugin disabled, a class named Minify_HTML to be loaded into scope by another plugin, and the malicious comment to be approved by a moderator before the payload renders.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

EPSS: 0.002210000 probability, percentile 0.115220000 (date 2026-10-05)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Optimizingmatters Autoptimize affected 3.1.15.1 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/b14f574d-1490-423e-9ef3-ce8f8... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3713884/autoptimize/trunk/classes/autoptimizeImages... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php [email protected] plugins.trac.wordpress.org
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: theviper17y (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-24T17:04:26.000ZVendor Notified
CNA2026-10-01T16:42:10.000ZDisclosed

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