What is CVE-2026-76216?

CVE-2026-76216 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-19.

How severe is CVE-2026-76216?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Go-Vikunja Vikunja

CVE-2026-76216

Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Go-vikunja Vikunja

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-76216?: CVE-2026-76216 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-19.
How severe is CVE-2026-76216?: High severity. CVSS v3 base score is 7.5 out of 10.