CVE-2026-116763mediumCWE-79

CVE-2026-116763: medium-severity vulnerability in litespeedtech LiteSpeed Cache

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

Published

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.4epss 0.3%
exploitation probability
0.3%top 72% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products
litespeedtech · LiteSpeed Cache
Related CVEs — litespeedtech LiteSpeed Cache

In the same product, most dangerous first.

CVE-2023-4372MEDIUMLiteSpeed Cache <= 5.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via ShortcodeEPSS 19.5%CVE-2026-18978HIGHLiteSpeed Cache <= 7.8.1 - Unauthenticated Stored Cross-Site Scripting via Comment ContentEPSS 0.4%CVE-2026-76579MEDIUMLiteSpeed Cache <= 7.9 - Reflected Cross-Site Scripting via ESI 'esi' ParameterEPSS 0.4%CVE-2025-12450MEDIUMLiteSpeed Cache <= 7.5.0.1 - Reflected Cross-Site ScriptingEPSS 0.4%CVE-2026-3375HIGHLiteSpeed Cache <= 7.7 - Unauthenticated Stored Cross-Site Scripting via QUIC.cloud CCSS/UCSS REST API EndpointsEPSS 0.4%CVE-2026-109215MEDIUMLiteSpeed Cache <= 7.9.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via VPI Image Attribute Re-SerializationEPSS 0.3%
References
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L103https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L173https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/lib/html-min.cls.php#L205https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimize.cls.php#L525https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/optimizer.cls.php#L57https://plugins.trac.wordpress.org/changeset?reponame=&old=3757253%40litespeed-cache&new=3757253%40litespeed-cachehttps://www.wordfence.com/threat-intel/vulnerabilities/id/99f876e0-8f13-468b-b5fa-ca61e3cf57b4?source=cve