EUVD-2026-78655
GHSA-ccgq-fx7h-2v4c
Severity by source
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
Network-reachable API but requires an authenticated account, so PR:L; integrity-only impact with no confidentiality or availability loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.
AnalysisAI
Broken object-level authorization in Vikunja before 2.6.0 lets any authenticated user write task-position records into project views belonging to other tenants by supplying a project_view_id that is never checked against the target task's project. Because only integrity of view ordering is affected (no read, no availability impact), the practical damage is cross-tenant data corruption and ordering manipulation rather than data theft. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated Vikunja session (CVSS PR:L) against a version below 2.6.0, plus knowledge or successful guessing of a project_view_id that belongs to a project view the attacker is not a member of - the vulnerability is that this identifier is never validated against the task's own project, not that it is secret. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N, VC:N/VI:L/VA:N) describes a low-complexity, network-reachable, authenticated integrity-only flaw, and the score of 5.3 is consistent with that: no confidentiality or availability loss, so this is not a data-exfiltration or denial-of-service issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Vikunja to 2.6.0 or later, which is the vendor-released fix and closes the missing project_view_id ownership check - the GHSA-w39f-h553-h2mx advisory at https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx should be treated as the authoritative source and the exact patched build confirmed against it before closing the ticket. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
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External POC / Exploit Code
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