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Xapian Core CVE-2026-77643

| EUVDEUVD-2026-63667 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-08-20 mitre GHSA-955x-jgcw-hcxh
XSS Xapian Core Suse
4.4
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
4.4 MEDIUM
AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
vuln.today AI
4.4 MEDIUM

AC:H reflects the specific corner-case trigger required; PR:L captures need for content-submission access; S:C and UI:R are correct for browser-rendered XSS with no availability impact.

3.1 AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
Aug 20, 2026 - 22:04 EUVD
Analysis Generated
Aug 20, 2026 - 21:51 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Incomplete HTML escaping in Xapian::MSet::snippet() within xapian-core exposes web applications using this search library to cross-site scripting attacks via a missed corner case of the previously patched CVE-2018-0499. Affected versions include all xapian-core releases before 2.1.0 and before 1.4.32. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker submits crafted document or query with malicious HTML payload
Delivery
Application indexes content via Xapian
Exploit
Victim performs search triggering MSet::snippet()
Execution
Corner-case escaping failure preserves raw HTML in snippet output
Persist
Application renders snippet in browser without secondary sanitization
Impact
Victim browser executes attacker JavaScript
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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) the attacker must hold at least low-privilege access sufficient to influence the content indexed by Xapian or the construction of search queries (PR:L per CVSS); (2) the deploying application must call Xapian::MSet::snippet() and render the returned HTML into a web page without a secondary escaping or sanitization step - applications that do not expose snippet() output in a browser context are not vulnerable; (3) a victim user must actively view the affected search results page (UI:R per CVSS). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 score of 4.4 (AV:N/AC:H/PR:L/UI:R/S:C) accurately reflects this vulnerability's constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with low-level access - such as the ability to submit documents for indexing or craft search queries - inserts content containing a specific HTML character sequence that the snippet() corner case fails to escape. When a victim user performs a search and the application renders the resulting snippet in their browser without further sanitization, the malicious payload executes as JavaScript in the victim's session. …
Remediation Upgrade xapian-core to version 2.1.0 or later (development series) or to version 1.4.32 or later (stable series), as documented in the Xapian developer mailing list announcement at https://lists.xapian.org/pipermail/xapian-devel/2026-August/003429.html and the security fix tracker at https://trac.xapian.org/wiki/SecurityFixes/2018-07-02. … Detailed patch versions, workarounds, and compensating controls in full report.
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A cross-site scripting vulnerability in queryparser/termgenerator_internal.cc in Xapian xapian-core before 1.4.6 exists

Same weakness CWE-79 – Cross-site Scripting (XSS)

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 SP5 Affected
SUSE Linux Enterprise Server 12 SP5 Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security Affected

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CVE-2026-77643 vulnerability details – vuln.today
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