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CVE-2026-54766

Vulnerability in code.vikunja.io/api (CVE-2026-54766)

Summary

Vulnerability in code.vikunja.io/api (CVE-2026-54766). Risk of unauthorized operations or information disclosure. Exploitable via POST /projects. Mitigation: upgrade to 2.4.0 or later.

Original description

The description as published by the source.

Summary

The project-duplication endpoint fails to enforce write access to the target parent project. Any authenticated (non-link-share) user can duplicate a project they can read into any parent project on the instance, regardless of whether they have write access to that parent — injecting an attacker-owned project into another user's or team's project hierarchy.

Details

ProjectDuplicate.CanCreate (pkg/models/project_duplicate.go) is meant to require write access to the parent the duplicate is placed under — its own comment says "Parent project exists + user has write access". The implementation does neither correctly:

func (pd *ProjectDuplicate) CanCreate(s *xorm.Session, a web.Auth) (canCreate bool, err error) {
    pd.Project = &Project{ID: pd.ProjectID}
    canRead, _, err := pd.Project.CanRead(s, a)
    if err != nil || !canRead {
        return canRead, err
    }
    if pd.ParentProjectID == 0 {
        return canRead, err
    }
    // Parent project exists + user has write access to is (-> can create new projects)
    parent := &Project{ID: pd.ParentProjectID}
    return parent.CanCreate(s, a)   // <-- bug
}

Two defects compound here:

  1. Wrong permission method. It calls parent.CanCreate ("may I create this project?") instead of parent.CanWrite ("may I create children inside this project?"). The latter is what the normal create path uses — POST /projects with a parent_project_id enforces parent.CanWrite via `Project.CanC…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-54766 has been found in code.vikunja.io/api.
Attackers can target a specific entry point like POST /projects over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade code.vikunja.io/api to 2.4.0 or later.
If unsure, ask your IT team or search "code.vikunja.io/api CVE-2026-54766" on the vendor's site.

CVE-2026-54766 (code.vikunja.io/api) — CWE-285
Attack surface: POST /projects / PUT /api/v1/projects/100/duplicate / POST /api/v1/projects / ProjectDuplicate.CanCreate
Patched: 2.4.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-285) exists in code.vikunja.io/api. Attackers reach the vulnerable code path via POST /projects.

📍 Affected scope

Check the vendor advisory for the affected versions of code.vikunja.io/api. Attack surface: POST /projects / PUT /api/v1/projects/100/duplicate / POST /api/v1/projects / ProjectDuplicate.CanCreate.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.4.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual POST /projects requests with malformed payloads or SQL meta-characters. Run grep -r 'code.vikunja.io/api' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'code.vikunja.io/api' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で code.vikunja.io/api を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Hunt for indicators of compromise detect 
    grep 'POST /projects' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで POST /projects への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 3
    Apply patch patch 
    Upgrade code.vikunja.io/api to 2.4.0

    ステージング環境で 2.4.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 2 で見つけた異常検知の続報チェックを含めること。

  4. 4
    Post-deployment verification verify 
    Replay attack against POST /projects on staging to confirm patch closes the vector

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

go code.vikunja.io/api
[{"type":"SEMVER","events":[{"introduced":"0.21.0"},{"fixed":"2.4.0"}]}]

References

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