LiteSpeed Cache <= 7.9.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via VPI Image Attribute Re-Serialization

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109215
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 10:17:02 UTC
Updated2026-10-29 14:56:26 UTC
DescriptionThe LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'bbp_reply_content' parameter in all versions up to, and including, 7.9.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that an administrator has enabled Viewport Images (VPI) and configured a VPI filename that matches an image the attacker can embed in user-generated content — such as a bbPress topic where Subscriber-level Participants are permitted to post replies containing raw img tags.

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: 0.003340000 probability, percentile 0.267570000 (date 2026-10-29)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation

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 7.9.1 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/media.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/media.cls.php [email protected] plugins.trac.wordpress.org
github.com/litespeedtech/lscache_wp/commit/0fc5f9ad69a138b8ee1fe2d07a5e9... [email protected] github.com
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.2/src/media.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/utility.cls.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/8bf9b130-bb1e-43fc-b5c9-33764... [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: Adrien Brunner (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-12T13:54:15.000ZVendor Notified
CNA2026-10-28T21:06:28.000ZDisclosed

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