Vikunja has Reflected HTML Injection via filter Parameter in Projects Module
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · 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, a reflected HTML injection vulnerability exists in the Projects module where the `filter` URL parameter is rendered into the DOM without output encoding when the user clicks "Filter." While `<script>` and `<iframe>` are blocked, `<svg>`, `<a>`, and formatting tags (`<h1>`, `<b>`, `<u>`) render without restriction — enabling SVG-based phishing buttons, external redirect links, and content spoofing within the trusted application origin. Version 2.0.0 fixes this issue.
Why it matters now
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-4qgr-4h56-8895 |
- 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-4qgr-4h56-8895
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-2026-27116
- 2026-10-03 Alias added: GHSA-4qgr-4h56-8895
References
Other 5
- https://vikunja.io/changelog/vikunja-v2.0.0-was-released
- https://github.com/go-vikunja/vikunja/commit/a42b4f37bde58596a3b69482cd5a67641a94f62d
- https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Scripting_Prevention_Cheat_Sheet.html
- https://github.com/go-vikunja/vikunja
- https://github.com/go-vikunja/vikunja/releases/tag/v2.0.0
More go-vikunja Vikunja vulnerabilities
- 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
Sources
- CVE-2026-27116 · CVE Program
- CVE-2026-27116 · NVD
- FIRST EPSS
- GHSA-4qgr-4h56-8895 · GitHub Advisory Database · CC BY 4.0
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