Vikunja has Missing Authorization on CalDAV Task Read
Priority MEDIUM 53CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00224 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vikunja (go-vikunja): 2.3.0code.vikunja.io/api (Go): 2.3.0
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 2.3.0 | 2.3.0 | Patch available | CNA |
| — | code.vikunja.io/api (Go) | before 2.3.0 | 2.3.0 | Patch available | GHSA-48ch-p4gq-x46x |
- vikunja Vendorgo-vikunja Affected before 2.3.0 Fixed in 2.3.0 Patch available CNA
- code.vikunja.io/api (Go) Vendor— Affected before 2.3.0 Fixed in 2.3.0 Patch available GHSA-48ch-p4gq-x46x
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* | before 2.3.0 | Vulnerable | go-vikunja |
- cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions before 2.3.0 Vulnerable ·go-vikunja
Remediation
- Fix · CNA vikunja (go-vikunja) Fixed in 2.3.0
- Fix · GHSA-48ch-p4gq-x46x code.vikunja.io/api (Go) Fixed in 2.3.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35598
- 2026-10-03 Alias added: GHSA-48ch-p4gq-x46x
References
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-2026-35598 · CVE Program
- CVE-2026-35598 · NVD
- FIRST EPSS
- GHSA-48ch-p4gq-x46x · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences