XSS in Cotonti
CVE-2026-100521
Cotonti through 1.0.0 contains a reflected cross-site scripting vulnerability in the search plugin highlight parameter that performs no HTML or JavaScript escaping. Attackers can craft malicious links with injected JavaScript in the highlight parameter that executes in the browser of any visitor who opens the link, including administrators.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Cotonti/Cotonti (product)
- github.com/Cotonti/Cotonti/blob/1.0.0/plugins/search/search.header.php (technical-description)
- github.com/Cotonti/Cotonti/blob/1.0.0/plugins/search/search.page.first.php (technical-description)
- github.com/Cotonti/Cotonti/issues/1907 (issue-tracking)
- github.com/Cotonti/Cotonti/pull/1908 (issue-tracking, patch)
- www.vulncheck.com/advisories/cotonti-through-1.0.0-reflected-xss-via-search-hig… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100521?
- CVE-2026-100521 is a medium-severity vulnerability in Cotonti, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-26.
- How severe is CVE-2026-100521?
- Medium severity. CVSS v3 base score is 6.1 out of 10.