Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck

CVE-2026-111917Vikunja 2.3.0 before 2.7.0 WebSocket Authentication Ignores Session Revocation

Medium 6.5

In plain English

A medium-severity security flaw 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 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 70.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja 2.3.0 before 2.7.0 contains an improper session validation vulnerability that allows attackers to keep WebSocket access after revocation because handleAuth never checks the JWT sid claim against the sessions table. Attackers holding a stolen access token can open or maintain connections to /api/v2/ws after session deletion or TOTP enrollment, continuing to receive the victim's notification.created pushes, including comment, task and project content.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.7.0	GHSA-4hv6-xc92-j86g
Go	code.vikunja.io/api	no fix listed	GO-2026-6715

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	2.3.0 – before 2.7.0

Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-4hv6-xc92-j86g) vendor-advisory
VulnCheck Advisory: Vikunja 2.3.0 before 2.7.0 WebSocket Authentication Ignores Session Revocation third-party-advisory