TI-2026-21967 Aliases CVE-2026-27575 GHSA-3ccg-x393-96v8

Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change

HIGH 80CWE-521Published 2026-02-25 · Updated 2026-02-26

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-521.

Summary

Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the application allows users to set weak passwords (e.g., 1234, password) without enforcing minimum strength requirements. Additionally, active sessions remain valid after a user changes their password. An attacker who compromises an account (via brute-force or credential stuffing) can maintain persistent access even after the victim resets their password. Version 2.0.0 contains a fix.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00473 41st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed vikunja (go-vikunja): 2.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

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	before 2.0.0	2.0.0	Patch available	CNA
—	code.vikunja.io/api (Go)	up to 0.24.6	—	No fix listed	GHSA-3ccg-x393-96v8

vikunja Vendorgo-vikunja Affected before 2.0.0 Fixed in 2.0.0 Patch available CNA
code.vikunja.io/api (Go) Vendor— Affected up to 0.24.6 Fixed in — No fix listed GHSA-3ccg-x393-96v8

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vikunja:vikunja::::::::	before 2.0.0	Vulnerable	go-vikunja

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions before 2.0.0 Vulnerable ·go-vikunja

Remediation

Fix · CNA vikunja (go-vikunja) Fixed in 2.0.0

Timeline

2026-10-02 Threatist record created from CVE-2026-27575
2026-10-03 Alias added: GHSA-3ccg-x393-96v8

References

Exploit 1

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-3ccg-x393-96v8

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-27575

Other 3

TI-2026-26971 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path CVSS 3.1CRITICAL 9.1
TI-2026-26060 Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission Escalation CVSS 3.1HIGH 7.5
TI-2026-20965 Vikunja Affected by XSS Via Task Preview CVSS 4.0HIGH 8.6
TI-2026-27698 Vikunja Affected by Privilege Escalation via Project Reparenting CVSS 3.1HIGH 8.3
TI-2026-25727 Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablement CVSS 3.1HIGH 8.1
TI-2026-25726 Vikunja has a 2FA Bypass via Caldav Basic Auth CVSS 4.0MEDIUM 6.9

See all 34 →

Sources

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