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CVE-2026-91983 Details

ANALYZED

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

Description

Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restricted data like comments, reactions, and time entries without proper permission verification.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/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-9rg3-v78m-26q8	CISA-ADP	AdvisoryExploitRemedyTechnical AnalysisVendor
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-9rg3-v78m-26q8	[email protected]	AdvisoryExploitRemedyTechnical AnalysisVendor
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-api-token-scope-bypass-via-expand-parameter	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-863	Incorrect Authorization	[email protected]

Affected Products

Product	Versions
Vikunja	>= 1.0.0, <= 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 15, 2026	New CVE Received	[email protected]
Sep 15, 2026	CVE Modified	CISA-ADP