TI-2026-26059 Aliases CVE-2026-33679 GHSA-g9xj-752q-xh63

Vikunja has SSRF via OpenID Connect Avatar Download that Bypasses Webhook SSRF Protections

HIGH 66CWE-918Published 2026-03-24 · Updated 2026-03-24

Key facts

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

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

Summary

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the `DownloadImage` function in `pkg/utils/avatar.go` uses a bare `http.Client{}` with no SSRF protection when downloading user avatar images from the OpenID Connect `picture` claim URL. An attacker who controls their OIDC profile picture URL can force the Vikunja server to make HTTP GET requests to arbitrary internal or cloud metadata endpoints. This bypasses the SSRF protections that are correctly applied to the webhook system. Version 2.2.1 patches the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00402 34th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed vikunja (go-vikunja): 2.2.1code.vikunja.io/api (Go): 2.2.1

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	before 2.2.1	2.2.1	Patch available	CNA
—	code.vikunja.io/api (Go)	before 2.2.1	2.2.1	Patch available	GHSA-g9xj-752q-xh63

vikunja Vendorgo-vikunja Affected before 2.2.1 Fixed in 2.2.1 Patch available CNA
code.vikunja.io/api (Go) Vendor— Affected before 2.2.1 Fixed in 2.2.1 Patch available GHSA-g9xj-752q-xh63

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vikunja:vikunja::::::::	before 2.2.1	Vulnerable	go-vikunja

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions before 2.2.1 Vulnerable ·go-vikunja

Remediation

Fix · CNA vikunja (go-vikunja) Fixed in 2.2.1
Fix · GHSA-g9xj-752q-xh63 code.vikunja.io/api (Go) Fixed in 2.2.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-33679
2026-10-03 Alias added: GHSA-g9xj-752q-xh63

References

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

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