CVE-2026-91972

HIGH 7.5

Vikunja before 2.6.0 Authentication Bypass via Unthrottled API

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja versions before 2.6.0 fail to apply rate limiting to /api/v2 public authentication endpoints including login, register, password-reset, and OAuth token routes. Remote unauthenticated attackers can perform unbounded credential guessing, account enumeration, and password-reset flooding attacks without throttling restrictions.

CWE	CWE-307
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

go-vikunja / vikunja

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-unthrottled-api

Credits

🔍 JellowBeanz26