CVE-2026-14287 TenWeb Speed Optimizer < 2.33.5 - Unauthenticated Stored XSS via Critical CSS Token Bypass
Unauthenticated attackers can inject malicious JavaScript into pages via stored XSS in the 10Web Booster plugin, affecting all visitors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-14287?
CVE-2026-14287 is a medium-severity cross-site scripting vulnerability in Unknown 10Web Booster, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The 10Web Booster WordPress plugin before 2.33.5 does not correctly validate an access token on an unauthenticated request handler and does not escape attacker-supplied stylesheet content before rendering it into the page head, allowing an unauthenticated attacker to store markup that executes as JavaScript in the browser of anonymous visitors to an affected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-14287?
How do I fix CVE-2026-14287?
No fix has been published for CVE-2026-14287 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-14287 being exploited?
There is no known exploitation of CVE-2026-14287 in the wild and no public exploit code.
Sources
Also known as GHSA-8qr6-f92h-v629.