Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck

CVE-2026-111921Vikunja 0.13.0 before 2.7.0 Incorrect Authorization in Link Share Deletion

Medium 5.4

In plain English

A medium-severity incorrect authorization in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 88.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja 0.13.0 before 2.7.0 contains an incorrect authorization vulnerability that allows project members with Write permission to delete admin-tier link shares because the delete permission check reads an unloaded share object. Attackers can send DELETE requests to the v1 or v2 projects shares endpoints with sequential share IDs to revoke admin links and invalidate existing share sessions.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.7.0	GHSA-fmmf-xq98-g327
Go	code.vikunja.io/api	no fix listed	GO-2026-6730

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	0.13.0 – before 2.7.0

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

GitHub Security Advisory (GHSA-fmmf-xq98-g327) vendor-advisory
VulnCheck Advisory: Vikunja 0.13.0 before 2.7.0 Incorrect Authorization in Link Share Deletion third-party-advisory