TI-2026-22002 Aliases CVE-2026-27616 GHSA-7jp5-298q-jg98

Vikunja Vulnerable to Stored Cross-Site Scripting (XSS) via Unsanitized SVG Attachment Upload Leading to Token Exposure

HIGH 65CWE-79Published 2026-02-25 · Updated 2026-02-26

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
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-79.

Summary

Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the application allows users to upload SVG files as task attachments. SVG is an XML-based format that supports JavaScript execution through elements such as <script> tags or event handlers like onload. The application does not sanitize SVG content before storing it. When the uploaded SVG file is accessed via its direct URL, it is rendered inline in the browser under the application's origin. As a result, embedded JavaScript executes in the context of the authenticated user. Because the authentication token is stored in localStorage, it is accessible via JavaScript and can be retrieved by a malicious payload. Version 2.0.0 patches this issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00512 43rd 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: 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 2.0.0	2.0.0	Patch available	CNA
—	code.vikunja.io/api (Go)	up to 0.24.6	—	No fix listed	GHSA-7jp5-298q-jg98

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-7jp5-298q-jg98

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-2026-27616
2026-10-03 Alias added: GHSA-7jp5-298q-jg98
2026-10-14 EPSS moved to the 50th–90th percentile
2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

https://github.com/user-attachments/files/25414870/Stored.XSS.Proof.of.concept.pdf

Advisory 2

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