CVE-2026-3129: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in litespeedtech LiteSpeed Cache
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.
CVE-2026-3129: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in litespeedtech LiteSpeed Cache
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.
CVSS v3.1
Score 6.4medium
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-02-24T16:38:54.193Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a91179facd9273b496fd55b
Added to database: 08/28/2026, 05:07:43 UTC
Last updated: 08/28/2026, 07:22:19 UTC
Views: 6
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