CVE-2026-3129

LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes

Published: Aug 28, 2026Updated: Aug 29, 2026 Sources: CVE List NVDCWE-79

6.4MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

litespeedtech

commercialaka openlitespeed, litespeed web server, litespeed cache

LiteSpeed CacheOn-prem

Networking Infrastructure / load-balancer-proxy

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-3129/

blog.litespeedtech.com

https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/media.cls.php#L761

plugins.trac.wordpress.org

https://plugins.trac.wordpress.org/changeset/3473912/

plugins.trac.wordpress.org

and 1 more references View all →

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