CVE-2026-78471 json
Autoptimize <= 3.1.15.1 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name
published last mo. modified last mo. also EUVD-2026-91179
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- optimizingmatters Autoptimize
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/b14f574d-1490-423e-9ef3-ce8f844cb8f0?source=cve
- plugins.trac.wordpress.org /browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L1232
- plugins.trac.wordpress.org /browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L960
- plugins.trac.wordpress.org /browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L908
- plugins.trac.wordpress.org /changeset?reponame=&new=3713884%40autoptimize%2Ftags%2F3.1.16&old=3657650%40autoptimize%2Ftags%2F3.1.15.1
- plugins.trac.wordpress.org /changeset/3713884/autoptimize/trunk/classes/autoptimizeImages.php
Sources
- CVE List CVE-2026-78471
- NVD CVE-2026-78471
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.