CVE-2026-123493

MEDIUM 5.4

Vikunja from 2.4.0 before 2.7.1 Authentication Bypass via Bot API Tokens

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja from 2.4.0 before 2.7.1 contains an authentication bypass vulnerability that allows disabled or locked users to retain access through API tokens owned by their bot users. Because token validation only checks the bot's own status, attackers holding pre-minted bot tokens can keep reading and modifying shared projects via the HTTP API, CalDAV, MCP and feeds.

CWE	CWE-613
Vendor	go-vikunja
Product	vikunja
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

go-vikunja / vikunja

2.4.0 < 2.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5fc2-w2j4-6r8w vulncheck.com: https://www.vulncheck.com/advisories/vikunja-from-2.4.0-before-2.7.1-authentication-bypass-via-bot-api-tokens

Credits

🔍 Cuong-VnC