The 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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
optimizingmatters Autoptimize unaffected
Version Status Constraints
0 affected ≤ 3.1.15.1

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L1232 cve-icon
https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L908 cve-icon
https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L960 cve-icon
https://plugins.trac.wordpress.org/changeset/3713884/autoptimize/trunk/classes/autoptimizeImages.php cve-icon
https://plugins.trac.wordpress.org/changeset?reponame=&new=3713884%40autoptimize%2Ftags%2F3.1.16&old=3657650%40autoptimize%2Ftags%2F3.1.15.1 cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/b14f574d-1490-423e-9ef3-ce8f844cb8f0?source=cve cve-icon
History

Fri, 02 Oct 2026 05:45:00 +0000

Type Values Removed Values Added
Description The 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.
Title Autoptimize <= 3.1.15.1 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-10-02T05:30:18.257Z

Reserved: 2026-08-24T16:49:16.127Z

Link: CVE-2026-78471

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses