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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-3129
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 05:16:42 UTC
Updated2026-08-29 00:16:37 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.001870000 probability, percentile 0.083250000 (date 2026-08-28)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Litespeedtech LiteSpeed Cache affected 7.7 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/media.cls.php [email protected] plugins.trac.wordpress.org
blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-3129 [email protected] blog.litespeedtech.com
plugins.trac.wordpress.org/changeset/3473912 [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/c107674d-173f-49cf-b329-e7bff... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: stealthcopter (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-27T00:00:00.000ZDiscovered
CNA2026-02-24T16:56:12.000ZVendor Notified
CNA2026-08-27T15:15:48.000ZDisclosed

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