CVE-2026-62367 Vikunja - Authentication Bypass

Vikunja 1.0.0 through 2.3.0 contains an authentication bypass caused by linking SSO login to local accounts using unverified email claims in OpenID Connect provider, letting attackers log in as victims without consent, exploit requires attacker to obtain a valid token with victim's email.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.09% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Upgrade to version 2.4.0 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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