TI-2026-76123 Aliases CVE-2026-111917 GHSA-355w-rx9g-pww7

Vikunja WebSocket Authentication Ignores Session Revocation

MEDIUM 64CWE-613Published 2026-10-17 · Updated 2026-10-19

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

Vikunja from 2.3.0 before 2.7.0 does not validate sessions for WebSocket connections, so revoked sessions keep access. The authentication handler never checks the JWT sid claim against the sessions table (CWE-613). An attacker holding a stolen access token can open or keep connections to the WebSocket endpoint after the session is deleted or TOTP is enrolled, and keep receiving the victim's notifications, including comment, task and project content. The attack requires low privileges (PR:L) in addition to the stolen token.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00355 29th percentileScored 2026-11-07

Fix Fixed vikunja (go-vikunja): 2.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
go-vikunja	vikunja	2.3.0 to before 2.7.0	2.7.0	Patch available	CNA

vikunja Vendorgo-vikunja Affected 2.3.0 to before 2.7.0 Fixed in 2.7.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:vikunja:vikunja::::::::	—	—	go-vikunja

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions — — ·go-vikunja

Remediation

Upgrade go-vikunja vikunja to 2.7.0. The sources list no fixed version for other branches.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA vikunja (go-vikunja) Fixed in 2.7.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-17
go-vikunja vikunja 2.7.0
5 records Highest priority Priority HIGH 1 HIGH, 3 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-76128 Permissive CORS policy trusting localhost origins in VikunjaPriority HIGH 67
- TI-2026-76125 Improper access revocation in Vikunja webhooks exposes project dataPriority MEDIUM 64
- TI-2026-76127 Incorrect authorization in Vikunja link share deletionPriority MEDIUM 57
Show all 5 records →

Timeline

2026-10-18 Threatist record created from CVE-2026-111917
2026-10-18 Alias added: GHSA-355w-rx9g-pww7
2026-10-18 Priority changed: MEDIUM → LOW
2026-10-19 CISA SSVC decision points changed
2026-10-19 Priority changed: LOW → MEDIUM

References

Advisory 1

GitHub Security Advisory (GHSA-4hv6-xc92-j86g)

TI-2026-40929 Authorization bypass in go-vikunja Vikunja CVSS 4.0CRITICAL 9.3
TI-2026-21967 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change CVSS 3.1CRITICAL 9.1
TI-2026-62115 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash CVSS 4.0HIGH 8.7
TI-2026-62108 Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth CVSS 4.0HIGH 8.7
TI-2026-62107 Vikunja before 2.6.0 Authentication Bypass via Unthrottled API CVSS 4.0HIGH 8.7
TI-2026-26971 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path CVSS 3.1CRITICAL 9.1

See all 105 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences