CVE-2026-91972

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCode.vikunja.io/api

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-307CWE-307

How to fix

Update

code.vikunja.io/api2.6.0 or later

Vendor advisories

github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q

Affected products

Product	Affected versions	Fixed in
code.vikunja.io/apiGo	v < 2.6.0, No range specified	2.6.0

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