CVE-2026-123518
Vikunja before 2.7.1 Missing Authorization in Kanban Task-Bucket Move
Vikunja before 2.7.1 contains an incorrect authorization vulnerability in TaskBucket.CanUpdate, which checks write access to the bucket's project and to the task separately but never verifies that both belong to the same project. Authenticated users with write access to two projects can move a task into another project's kanban bucket. This persists cross-project task_buckets rows that count toward bucket limits and, for done buckets, toggle the task's done state.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| vikunja go-vikunja code.vikunja.io/api
golang |
≥ 0; < 2.7.1 (affected, semver) 2.7.1 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 4.3 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | CNA: VulnCheck |
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 4.3 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | NVD: [email protected] |
Exploit evidence
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w64q-7p4m-j8g8
exploit · ADP: CISA-ADP
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w64q-7p4m-j8g8CNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/vikunja-before-2.7.1-missing-authorization-in-kanban-task-bucket-moveCNA: VulnCheck · third-party-advisory
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w64q-7p4m-j8g8ADP: CISA-ADP · exploit
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w64q-7p4m-j8g8[email protected]
- https://www.vulncheck.com/advisories/vikunja-before-2.7.1-missing-authorization-in-kanban-task-bucket-move[email protected]
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