Is CVE-2026-77643 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-77643?

CVE-2026-77643 has a CVSS v3 severity of MEDIUM (4.4).

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CVE-2026-77643

Description

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.