Low severity · published Oct 23, 2026
CVE-2026-111737
Speed Optimizer < 7.8.5 - Admin+ Stored XSS via DNS Prefetch and Font Preload URL Lists
New
3.5
CVSS
0.2%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SO
Speed Optimizer ·
before 7.8.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111737
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111737
wpscan.com
https://wpscan.com/vulnerability/308b6173-139d-4940-869d-c9ff1e83c323/
More from Speed Optimizer
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CVE-2026-3220
Multiple Plugins - Unauthenticated Stored XSS via Minify Library
5.5
CVE-2026-111738
Speed Optimizer < 7.8.5 - Admin+ Network Option Update via enable-option/disable-option