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CVE-2026-91981 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:3.1 LOWVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr	[email protected]	AdvisoryExploitRemedyVendor
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-user-enumeration-via-v2-api	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

Product	Versions
Vikunja	<= 2.5.0 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 2.6.0moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 21, 2026	CVE Modified	CISA-ADP
Sep 15, 2026	New CVE Received	[email protected]