CVE-2026-54766

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
5.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplication operation in pkg/models/project_duplicate.go allows an authenticated user who can read a source project to place its duplicate beneath an arbitrary target parent project. ProjectDuplicate.CanCreate calls parent.CanCreate on an unhydrated Project containing only the body supplied parent_project_id instead of calling parent.CanWrite, so the target parent write-permission check is skipped. The ordinary project creation path enforces that permission, but PUT /api/v1/projects/{project}/duplicate does not, allowing attacker-owned content to be injected into another user or team project hierarchy. This issue is fixed in version 2.4.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
GitHub advisoryMentions a patch (unverified)

Project duplication bypasses write-permission check on the target parent project · Advisory · go-vikunja/vikunja · GitHub

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f27p-pw2p-9pr4
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 pull request

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 d911caaa11c7 (go-vikunja/vikunja)

Fix landed in go-vikunja/vikunja commit d911caaa11c7 — awaiting tagged release

https://github.com/go-vikunja/vikunja/commit/d911caaa11c748c3abc6b98b3189afea2677bcb0

Vendor Advisories for CVE-2026-54766(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 rangeFix by version rangeDependents
code.vikunja.io/api—
  • 0.21.0 up to 2.4.0: fixed in 2.4.0
  • 0.21.0 on: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 56× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-10 00:51 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-09 02:39 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-10-08 00:51 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-10-06 22:56 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-10-06 00:48 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-10-05 01:20 UTCEG score recompute
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-10-04 02:35 UTCEG score recompute
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-10-03 04:26 UTCEG score recompute
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-10-02 06:16 UTCEG score recompute
Show 57 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-10-01 07:28 UTCEG score recompute
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  4. 2026-09-30 09:19 UTCEG score recompute
  5. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-09-29 11:10 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-09-27 14:23 UTCEG score recompute
  9. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-09-26 15:36 UTCEG score recompute
  12. 2026-09-24 18:43 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-09-23 19:52 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-09-22 20:17 UTCEG score recompute
  17. 2026-09-21 22:04 UTCEG score recompute
  18. 2026-09-20 23:56 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-09-20 01:47 UTCEG score recompute
  21. 2026-09-19 03:39 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  23. 2026-09-18 05:31 UTCEG score recompute
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-17 07:22 UTCEG score recompute
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  27. 2026-09-16 09:11 UTCEG score recompute
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  29. 2026-09-15 10:07 UTCEG score recompute
  30. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  31. 2026-09-14 11:57 UTCEG score recompute
  32. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  33. 2026-09-12 15:40 UTCEG score recompute
  34. 2026-09-11 17:32 UTCEG score recompute
  35. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-10 19:23 UTCEG score recompute
  37. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-09-09 00:53 UTCEG score recompute
  39. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-09-07 04:37 UTCEG score recompute
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-09-06 06:28 UTCEG score recompute
  43. 2026-09-05 08:20 UTCEG score recompute
  44. 2026-09-04 10:11 UTCEG score recompute
  45. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-09-03 12:01 UTCEG score recompute
  47. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-09-01 15:24 UTCEG score recompute
  49. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  51. 2026-08-31 17:14 UTCEG score recompute
  52. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  53. 2026-08-30 19:05 UTCEG score recompute
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  55. 2026-08-28 20:24 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  56. 2026-08-28 20:24 UTCNVD updateCVSS v3 → 5.3 · CVSS v4 → 5.3
  57. 2026-08-28 17:12 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-54766?
CVE-2026-54766 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplication operation in pkg/models/projectduplicate.go allows an authenticated user who can read a source project to place its duplicate beneath an arbitrary target parent project.…
When was the CVE record for CVE-2026-54766 published?
The CVE record for CVE-2026-54766 was published on August 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-54766 actively exploited?
CVE-2026-54766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54766?
CVE-2026-54766 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54766?
A fix for CVE-2026-54766 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54766 are linked in the Vendor Advisories panel on this page.

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