TI-2026-23380 Aliases CVE-2026-29794 GHSA-m547-hp4w-j6jx

Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers

MEDIUM 63CWE-807Published 2026-03-20 · Updated 2026-03-20

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00349 28th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed vikunja (go-vikunja): 2.2.0code.vikunja.io/api (Go): 2.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
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	0.8 to before 2.2.0	2.2.0	Patch available	CNA
—	code.vikunja.io/api (Go)	0.8 to before 2.2.0	2.2.0	Patch available	GHSA-m547-hp4w-j6jx

vikunja Vendorgo-vikunja Affected 0.8 to before 2.2.0 Fixed in 2.2.0 Patch available CNA
code.vikunja.io/api (Go) Vendor— Affected 0.8 to before 2.2.0 Fixed in 2.2.0 Patch available GHSA-m547-hp4w-j6jx

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vikunja:vikunja::::::::	0.8 to before 2.2.0	Vulnerable	go-vikunja

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions 0.8 to before 2.2.0 Vulnerable ·go-vikunja

Remediation

Fix · CNA vikunja (go-vikunja) Fixed in 2.2.0
Fix · GHSA-m547-hp4w-j6jx code.vikunja.io/api (Go) Fixed in 2.2.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-29794
2026-10-03 Alias added: GHSA-m547-hp4w-j6jx

References

Exploit 1

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m547-hp4w-j6jx

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-29794

Other 3

TI-2026-21967 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change CVSS 3.1CRITICAL 9.1
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

See all 34 →

Sources

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