CVE-2026-77643
Xapian Cross-Site Scripting Vulnerability
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.
INFO
Published Date :
Aug. 20, 2026, 10:18 p.m.
Last Modified :
Aug. 20, 2026, 10:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 8254265b-2729-46b6-b9e3-3dfca2d5bfca | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Xapian core to version 1.4.32 or 2.1.0.
- Apply vendor patches for Xapian core.
- Ensure all HTML escaping is complete.
- Review related security advisories.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-77643.
| URL | Resource |
|---|---|
| https://bugs.debian.org/1144490 | |
| https://lists.xapian.org/pipermail/xapian-devel/2026-August/003429.html | |
| https://trac.xapian.org/wiki/SecurityFixes/2018-07-02#a2026-08-13update |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-77643 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-77643
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-77643 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-77643 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 20, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Xapian', 'product': 'xapian-core', 'versions': [{'status': 'affected', 'version': '2.0.0', 'lessThan': '2.1.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '1.4.32', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Reference https://bugs.debian.org/1144490 Added Reference https://lists.xapian.org/pipermail/xapian-devel/2026-August/003429.html Added Reference https://trac.xapian.org/wiki/SecurityFixes/2018-07-02#a2026-08-13update