LiteSpeed Cache <= 7.9.1 - Unauthenticated Stored Cross-Site Scripting via HTML Minifier Predictable Placeholder (md5(REQUEST_TIME) + two-pass str_replace)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116763
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 10:17:03 UTC
Updated2026-10-29 14:56:26 UTC
DescriptionThe LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 7.9.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the HTML Minify option (O_OPTM_HTML_MIN) is enabled and a companion plugin renders stored comment content into a raw-text context such as a JSON-LD script block on the same page.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

EPSS: 0.003410000 probability, percentile 0.275850000 (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]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:H/PR:N/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
www.wordfence.com/threat-intel/vulnerabilities/id/99f876e0-8f13-468b-b5fa-ca61e... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimizer.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimize.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php [email protected] plugins.trac.wordpress.org
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: Santh (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-26T21:31:01.000ZVendor Notified
CNA2026-10-28T21:04:19.000ZDisclosed

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