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CVE-2026-77643

Quick assessment

Affected
Xapian xapian-core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xapian xapian-core 在 2.1.0 之前以及 1.4.32 之前的版本中，queryparser/termgenerator_internal.cc 存在跨站脚本（XSS）漏洞。该漏洞是由于 Xapian::MSet::snippet() 函数对 HTML 的转义不完整所致。注意：此问题源于 CVE-2018-0499 未处理的边界情况。

CVSS 4.4 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
Xapian xapian-core 2.0.0< 2.1.0 affected
< 1.4.32 affected
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I. Basic Information for CVE-2026-77643

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xapian xapian-core 2.0.0 ~ 2.1.0 -

II. Public POCs for CVE-2026-77643

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77643

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Vendor Advisories for CVE-2026-77643 (2)

Mailing List Discussions for CVE-2026-77643 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-77643

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