CVE-2026-33678 json
Vikunja has IDOR in Task Attachment ReadOne Allows Cross-Project File Access and Deletion
published 2026-03-24 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-14921 , GHSA-jfmm-mjcp-8wq2 , GO-2026-4853
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue.
Patch / fix
- go code.vikunja.io/api 2.2.1
- vikunja vikunja 2.2.1
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <2.2.1 all versions |
2.2.1 |
Affected products
- go-vikunja vikunja
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2
web, exploit, vendor-advisory, advisory
-
vikunja.io
/changelog/vikunja-v2.2.2-was-released
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-33678
advisory
-
github.com
/go-vikunja/vikunja
package
Sources
- CVE List CVE-2026-33678
- GitHub Advisory GHSA-jfmm-mjcp-8wq2
- NVD CVE-2026-33678
- OSV GO-2026-4853
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.