Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied task_id but TaskBucket.CanUpdate in pkg/models/kanban_task_bucket.go authorizes only the project, view, and bucket from the URL. updateTaskBucket then calls Task.ReadOne without a separate task permission check, returns the victim task contents, and can update the task done state when the attacker chooses a done bucket. Because task identifiers are global sequential values, an authenticated user can enumerate cross-tenant tasks and modify their completion metadata through both the v1 and v2 routes that share this model. This issue is fixed in version 2.4.0.
CVE-2026-55066
HIGHPre-NVD 7.17.1
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.1
- EG Score
- 7.1(low)
- EG Risk
- 36(Track)EG Risk 36/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity71% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 19%
- KEV
- Not listed
Published
August 28, 2026
Last Modified
August 28, 2026
Advisory Details (4)
Auto-updated Aug 28, 2026🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available
Cross-tenant IDOR in kanban move-task endpoint via unauthorized body task_id · Advisory · go-vikunja/vikunja · GitHub
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrggithub_release Patch Available
v2.4.0
Patch available: go-vikunja/vikunja v2.4.0
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0github_pr
Fix security vulnerabilities
Fix merged in go-vikunja/vikunja PR #3239 on 2026-07-19 — awaiting tagged release
https://github.com/go-vikunja/vikunja/pull/3239github_commit
commit 36cdc2ce2be0 (go-vikunja/vikunja)
Fix landed in go-vikunja/vikunja commit 36cdc2ce2be0 — awaiting tagged release
https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65fVendor Advisories for CVE-2026-55066(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-28 20:25 UTCEG score recompute
- 2026-08-28 17:11 UTCEG score recompute
Frequently asked(5)
What is CVE-2026-55066?
CVE-2026-55066 is a high vulnerability published on August 28, 2026. Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied taskid but TaskBucket.CanUpdate in pkg/models/kanbantask_bucket.go authorizes only the project, view, and bucket from the URL.…
When was CVE-2026-55066 disclosed?
CVE-2026-55066 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55066 actively exploited?
CVE-2026-55066 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55066?
CVE-2026-55066 has a CVSS v3 base score of 7.1 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-55066?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55066, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-55066
Is Your Infrastructure Affected by CVE-2026-55066?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.