MSRXVulnerabilities / CVE-2026-3129
CVE-2026-3129
Published 2026-08-28 · Deferred
CVE-2026-3129
LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes
6.4 MEDIUM
CVSS 3.1 · CNA · wordfence.com
CVSS 3.1 · CNA · wordfence.com
0.3%
chance of exploitation in the next 30 days (EPSS; higher than 26% of CVEs)
chance of exploitation in the next 30 days (EPSS; higher than 26% of CVEs)
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
Affected products
- litespeedtech LiteSpeed Cache: 0 to ≤ 7.7
Weakness: CWE-79
4 references (advisories, patches, write-ups)
- https://blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-3129/
- https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/media.cls.php#L761
- https://plugins.trac.wordpress.org/changeset/3473912/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/c107674d-173f-49cf-b329-e7bffaee841d?source=cve
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.