Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck

CVE-2026-111920Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions

Medium 4.3

In plain English

A medium-severity privilege mismanagement 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 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 91.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go), which resolves a user's effective project permission as the maximum over the project tree, silently overriding explicit lower-permission shares on sub-projects. A collaborator with write access on a parent project but read-only access to a child project can modify the child project's tasks and content.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.7.0	GHSA-pjr3-86v4-5p7w
Go	code.vikunja.io/api	no fix listed	GO-2026-6745

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	2.6.0

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-pjr3-86v4-5p7w) vendor-advisory
VulnCheck Advisory: Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions third-party-advisory