XSS in Alaev Seo Tools Extension
CVE-2026-19988
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
- Alaev Seo Tools Extension — versions 1.0.0, 1.0.1, 1.0.2
Weakness classification (CWE)
References
- vuldb.com/vuln/391192 (technical-description, vdb-entry)
- vuldb.com/vuln/391192/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-19988 (third-party-advisory)
- vuldb.com/submit/873939 (third-party-advisory)
- github.com/xryj920/chrome_extensions/blob/main/Alaev & Co Alaev SEO Tools 1.0.1… (exploit)
Frequently asked questions
- What is CVE-2026-19988?
- CVE-2026-19988 is a medium-severity vulnerability in Alaev Seo Tools Extension, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2026-08-17.
- How severe is CVE-2026-19988?
- Medium severity. CVSS v3 base score is 4.3 out of 10.