CVE-2026-19988 Alaev SEO Tools Extension Popup UI popup.html addDiv cross site scripting
Remote attackers can execute arbitrary scripts via the Popup UI addDiv function in the Alaev SEO Tools Chrome extension.
- 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-2026-19988?
CVE-2026-19988 is a medium-severity cross-site scripting vulnerability in Alaev SEO Tools Extension, published on 17 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
A vulnerability was detected in Alaev SEO Tools Extension up to 1.0.10 on Chrome. This impacts the function addDiv of the file src/popup.html of the component Popup UI. Performing a manipulation results in basic cross site scripting. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-19988?
How do I fix CVE-2026-19988?
No fix has been published for CVE-2026-19988 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-2026-19988 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19988 exists.
Sources
Also known as GHSA-j9f9-35vr-8rpw.