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CVE-2026-123503

Vikunja before 2.7.1 Improper Authorization in Kanban Bucket Deletion

Vikunja before 2.7.1 contains an improper authorization vulnerability in canDoBucket that allows users with project write access to delete buckets via a mismatched view ID. Attackers can request deletion through another view's bucket endpoint to bypass the last-bucket rule, leaving dangling default/done bucket references and inconsistent task buckets.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123499

Vikunja veans before 2.7.1 Credential Leak via Repo-Controlled .veans.yml Server

Vikunja veans before 2.7.1 contains a credential exposure vulnerability that allows malicious repository authors to capture API tokens by specifying an attacker-controlled server in .veans.yml. When veans runs in an untrusted checkout, it sends VEANS_TOKEN as a Bearer token, or login passwords, TOTP codes and tokens, to that server, granting attackers the victim's Vikunja access.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123495

Vikunja 2.0.0 before 2.7.1 Login CSRF via /api/v2 Login and OIDC Callback

Vikunja 2.0.0 before 2.7.1 accepts form-encoded bodies on the /api/v2 login and OIDC callback endpoints without CSRF or Origin checks, enabling login cross-site request forgery. An attacker with an account can lure a victim to a page posting the attacker's credentials or OIDC code, switching the victim into the attacker's account and exposing data the victim then adds.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123529

Vikunja before 2.7.1 Stored CSS Injection via TipTap Table Cell data-background-color

Vikunja before 2.7.1 contains a stored CSS injection vulnerability that allows authenticated users with project write access to inject arbitrary CSS via unsanitized table-cell data-background-color attributes. Attackers can store crafted task descriptions or comments to render full-viewport phishing overlays or force zero-click outbound background-image requests that deanonymize viewers.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123525

Vikunja before 2.7.1 Memory Exhaustion DoS via Trello, Todoist and Microsoft To Do Migrations

Vikunja before 2.7.1 allocates memory without limits in its Trello, Todoist and Microsoft To Do migration importers, which buffer remote attachment downloads and API responses in memory without size caps. Authenticated users can start a migration that references huge attacker-served attachments or yields oversized API responses, exhausting memory and crashing the shared API process for all tenants.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123521

Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint

Vikunja before 2.7.1 contains an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the password via /user/settings/totp/disable without lockout, then disable TOTP without a code for persistent account takeover.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123517

Vikunja before 2.7.1 Information Disclosure via Team Self-Removal Endpoint

Vikunja before 2.7.1 contains an information disclosure vulnerability that allows authenticated users to determine whether private teams exist by calling the team member self-removal endpoint. Attackers can send DELETE requests to /teams/{id}/members/{own username} for arbitrary team ids and use the distinguishable responses to learn if a team exists, is SSO-managed, or has a single member.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123513

Vikunja before 2.7.1 Auth Token Leak via API URL Change

Vikunja before 2.7.1 contains a credential exposure vulnerability that allows attackers to steal stored auth tokens by inducing users to switch the frontend API URL. Because checkAndSetApiUrl leaves origin-independent localStorage tokens in place, the bearer token and desktop OAuth refresh token are sent to the attacker's server, enabling account takeover.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123509

Vikunja before 2.7.1 Denial of Service via Unbounded Kanban Bucket Count

Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows project writers or view admins to create unlimited kanban buckets due to missing count caps. Attackers can create thousands of buckets so every kanban read runs a task SELECT and COUNT per bucket, generating heavy database load.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123505

Vikunja before 2.7.1 World-Readable Local File Storage and SQLite Database

Vikunja before 2.7.1 contains an insecure file permissions vulnerability that allows local users to read stored data because localStorage.Write creates blobs world-readable. Local attackers on a shared host can read attachments, project backgrounds and exports, and copy the SQLite database to crack password hashes offline.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123501

Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes

Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory through concurrent image decodes in avatar and background uploads. Attackers can send several parallel tiny, highly compressible PNGs decoded at up to 50 megapixels each, pushing the API process into memory pressure or an OOM kill.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123497

Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery

Vikunja veans before 2.7.1 contains a protocol downgrade vulnerability in serverCandidates that allows on-path attackers to force plain HTTP during veans init and login. Attackers can block HTTPS ports so discovery accepts an unverified HTTP response, capturing passwords, TOTP codes or bot tokens and persisting cleartext API traffic.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123493

Vikunja from 2.4.0 before 2.7.1 Authentication Bypass via Bot API Tokens

Vikunja from 2.4.0 before 2.7.1 contains an authentication bypass vulnerability that allows disabled or locked users to retain access through API tokens owned by their bot users. Because token validation only checks the bot's own status, attackers holding pre-minted bot tokens can keep reading and modifying shared projects via the HTTP API, CalDAV, MCP and feeds.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Go-vikunja Vikunja
Products
Vikunja Vikunja
CVE-2026-123530

Vikunja before 2.7.1 Missing Step-Up Authentication via TOTP Enrollment Endpoints

Vikunja before 2.7.1 contains a missing authentication vulnerability that allows attackers holding a stolen session to enroll and enable TOTP without the account password. Attackers can call the TOTP enroll and enable endpoints with their own secret to lock the owner out, persisting even after password reset.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123526

Vikunja before 2.7.1 Mass Assignment via Team external_id Field

Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123522

Vikunja before 2.7.1 Task Information Disclosure via Kanban Bucket Move Webhook

Vikunja before 2.7.1 contains an authorization bypass vulnerability that allows authenticated users to read any task by injecting a crafted task object into a no-op Kanban bucket move. Attackers can set task.id to a victim task and task.project_id to their own project, routing full task contents to their webhook and forging mention notifications.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123518

Vikunja before 2.7.1 Missing Authorization in Kanban Task-Bucket Move

Vikunja before 2.7.1 contains an incorrect authorization vulnerability in TaskBucket.CanUpdate, which checks write access to the bucket's project and to the task separately but never verifies that both belong to the same project. Authenticated users with write access to two projects can move a task into another project's kanban bucket. This persists cross-project task_buckets rows that count toward bucket limits and, for done buckets, toggle the task's done state.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Go-vikunja Vikunja
Products
Vikunja Vikunja
CVE-2026-123514

Vikunja before 2.7.1 Orphaned Export Archives Enable Disk Exhaustion

Vikunja before 2.7.1 contains an improper resource cleanup vulnerability that leaves full-data export archives orphaned on disk after re-exports, failed exports, or account deletion. Authenticated users can repeatedly re-trigger exports containing all their attachments to exhaust disk storage, while deleted users' personal data remains retained indefinitely.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123510

Vikunja before 2.7.1 Plugin and Log Directories Not Anchored to Rootpath

Vikunja before 2.7.1 fails to re-anchor PluginsDir and LogPath to service.rootpath, allowing plugins to load from and logs to be written in the startup working directory. Local attackers able to write to that directory can plant plugins loaded into the server when plugins are enabled, or read misplaced logs including audit.log.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja
CVE-2026-123506

Vikunja 2.2.0 before 2.7.1 Token Scope Bypass via Project Webhook Endpoints

Vikunja from 2.2.0 before 2.7.1 contains an authorization bypass vulnerability that allows holders of tokens scoped only to projects_webhooks to manage the owner's user-level webhooks by supplying user_id in request bodies. Attackers can register user webhooks to their own receiver to obtain reminders and task payloads from all owner projects, and read, change or delete existing user webhooks.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vikunja
Products
Vikunja