What is CVE-2026-77643?

CVE-2026-77643 is a medium-severity vulnerability in Xapian Xapian-Core, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-08-20.

How severe is CVE-2026-77643?

Medium severity. CVSS v3 base score is 4.4 out of 10.

XSS in Xapian Xapian-Core

CVE-2026-77643

A cross-site scripting vulnerability in queryparser/termgenerator_internal.cc in Xapian xapian-core before 2.1.0 and before 1.4.32 exists due to incomplete HTML escaping by Xapian::MSet::snippet(). NOTE: this issue exists because of a missed corner case of CVE-2018-0499.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Xapian Xapian-core

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-77643?: CVE-2026-77643 is a medium-severity vulnerability in Xapian Xapian-Core, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-08-20.
How severe is CVE-2026-77643?: Medium severity. CVSS v3 base score is 4.4 out of 10.