The 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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00341.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
litespeedtech LiteSpeed Cache unaffected
Version Status Constraints
0 affected ≤ 7.9.1

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L103 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L173 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L205 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimize.cls.php#L525 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimizer.cls.php#L57 cve-icon cve-icon
https://plugins.trac.wordpress.org/changeset?reponame=&old=3757253%40litespeed-cache&new=3757253%40litespeed-cache cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/99f876e0-8f13-468b-b5fa-ca61e3cf57b4?source=cve cve-icon cve-icon
History

Thu, 29 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 29 Oct 2026 09:45:00 +0000

Type Values Removed Values Added
Description The 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.
Title LiteSpeed Cache <= 7.9.1 - Unauthenticated Stored Cross-Site Scripting via HTML Minifier Predictable Placeholder (md5(REQUEST_TIME) + two-pass str_replace)
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-10-29T10:45:40.785Z

Reserved: 2026-10-26T21:13:09.487Z

Link: CVE-2026-116763

cve-icon Vulnrichment

Updated: 2026-10-29T10:35:40.639Z

cve-icon NVD

Status : Deferred

Published: 2026-10-29T10:17:03.590

Modified: 2026-10-29T14:56:26.107

Link: CVE-2026-116763

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T10:30:11Z

Weaknesses