CVE-2026-55066

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. 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: epss, 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.

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.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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 computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 9, 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-m483-7vrg
github_release Patch Available

v2.4.0

Patch available: go-vikunja/vikunja v2.4.0

https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0
github_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/3239
github_commit

commit 36cdc2ce2be0 (go-vikunja/vikunja)

Fix landed in go-vikunja/vikunja commit 36cdc2ce2be0 — awaiting tagged release

https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65f

Vendor 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.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
code.vikunja.io/api—2.4.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 44× 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.

  1. 2026-09-20 21:55 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-19 21:59 UTCEG score recompute
  4. 2026-09-18 21:28 UTCEG score recompute
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 21:25 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescore
  8. 2026-09-16 21:29 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 09:11 UTCEG score recompute
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 08:48 UTCEG score recompute
  13. 2026-09-15 03:11 UTCEPSS rescore
  14. 2026-09-13 20:55 UTCEG score recompute
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-12 20:59 UTCEG score recompute
  17. 2026-09-11 21:03 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-10 21:07 UTCEG score recompute
  20. 2026-09-10 09:35 UTCEPSS rescore
  21. 2026-09-09 00:27 UTCEG score recompute
  22. 2026-09-08 22:01 UTCEPSS rescore
  23. 2026-09-07 20:24 UTCEG score recompute
  24. 2026-09-07 16:01 UTCEPSS rescore
  25. 2026-09-06 20:24 UTCEG score recompute
Show 19 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-05 20:27 UTCEG score recompute
  3. 2026-09-04 20:32 UTCEG score recompute
  4. 2026-09-04 08:21 UTCEG score recompute
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 20:24 UTCEG score recompute
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 19:37 UTCEG score recompute
  9. 2026-09-01 13:54 UTCEPSS rescore
  10. 2026-09-01 07:30 UTCEG score recompute
  11. 2026-09-01 04:40 UTCEPSS rescore
  12. 2026-08-31 19:31 UTCEG score recompute
  13. 2026-08-31 19:07 UTCEG score recompute
  14. 2026-08-30 20:18 UTCEG score recompute
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 08:20 UTCEG score recompute
  17. 2026-08-30 01:22 UTCEPSS rescore
  18. 2026-08-28 20:25 UTCEG score recompute
  19. 2026-08-28 17:11 UTCEG score recompute

Related CVEs(same CWE)

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, with the most recent update on September 9, 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 80.5% 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).
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

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