CVE-2026-91972 Vikunja - Authentication Bypass

Vikunja < 2.6.0 contains a broken authentication caused by lack of rate limiting on /api/v2 public authentication endpoints, letting remote unauthenticated attackers perform credential guessing, account enumeration, and password-reset flooding without throttling.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.63% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-307

Vendor fix

Update to version 2.6.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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