CVE-2026-3129
LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes
- State
- Published
- Severity
- 6.4 Medium
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Reserved
- Feb 24, 2026
Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via crafted `<img>` tag attributes in all versions up to, and including, 7.7. This is due to a flawed regular expression that is used to strip `width` and `height` attributes from images when the "Lazy Load Images" and "Add Missing Sizes" features are enabled. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that execute whenever a user accesses an injected page.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N | Wordfence |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
LiteSpeed Cachelitespeedtech |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/c107674d-173f-49cf-b329-e7bffaee841d?source=cve
- https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/media.cls.php#L761
- https://plugins.trac.wordpress.org/changeset/3473912/
- https://blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-3129/
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