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CVE-2026-78471— Autoptimize <= 3.1.15.1 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name

Quick assessment

Affected
optimizingmatters Autoptimize
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Autoptimize 插件在 3.1.15.1 及更早版本中存在存储型跨站脚本漏洞（Stored Cross-Site Scripting），该漏洞位于评论作者名字段中。由于输入清理和输出转义不充分，未经身份验证的攻击者可以在页面中注入任意 Web 脚本，当用户访问被注入脚本的页面时，这些脚本将自动执行。 漏洞利用需要满足以下条件： 1. 管理员启用了 Autoptimize 的“懒加载图片”（Lazy-load images?）选项； 2. 磁盘上存在 w3-total-cache/w3

CVSS 5.4 · Medium EPSS 0.22% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
optimizingmatters Autoptimize ≤ 3.1.15.1 affected
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I. Basic Information for CVE-2026-78471

Vulnerability Information
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Vulnerability Title
Autoptimize <= 3.1.15.1 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
optimizingmatters Autoptimize 0 ~ 3.1.15.1 -

II. Public POCs for CVE-2026-78471

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III. Intelligence Information for CVE-2026-78471

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Patches & Fixes for CVE-2026-78471 (1)

News Coverage for CVE-2026-78471 (1)

IV. Related Vulnerabilities

Same product: Autoptimize
Same vendor: optimizingmatters
Same weakness: CWE-79

V. Comments for CVE-2026-78471

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