{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33678", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-23T16:34:59.930Z", "datePublished": "2026-03-24T15:44:06.336Z", "dateUpdated": "2026-03-24T17:04:42.454Z"}, "containers": {"cna": {"title": "Vikunja has IDOR in Task Attachment ReadOne Allows Cross-Project File Access and Deletion", "problemTypes": [{"descriptions": [{"cweId": "CWE-639", "lang": "en", "description": "CWE-639: Authorization Bypass Through User-Controlled Key", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2"}, {"name": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released", "tags": ["x_refsource_MISC"], "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"}], "affected": [{"vendor": "go-vikunja", "product": "vikunja", "versions": [{"version": "< 2.2.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-24T15:44:06.336Z"}, "descriptions": [{"lang": "en", "value": "Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue."}], "source": {"advisory": "GHSA-jfmm-mjcp-8wq2", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-24T17:04:09.861908Z", "id": "CVE-2026-33678", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-24T17:04:42.454Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*", "matchCriteriaId": "E8647862-9C78-473D-9FED-7AFC24335A61", "versionEndExcluding": "2.2.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue."}, {"lang": "es", "value": "Vikunja es una plataforma de gesti\u00f3n de tareas de c\u00f3digo abierto y autoalojada. Antes de la versi\u00f3n 2.2.1, 'TaskAttachment.ReadOne()' consulta los adjuntos solo por ID ('WHERE id = ?'), ignorando el ID de la tarea de la ruta URL. La verificaci\u00f3n de permisos en 'CanRead()' valida el acceso a la tarea especificada en la URL, pero 'ReadOne()' carga un adjunto diferente que puede pertenecer a una tarea en otro proyecto. Esto permite a cualquier usuario autenticado descargar o eliminar cualquier adjunto en el sistema proporcionando su propio ID de tarea accesible junto con un ID de adjunto objetivo. Los ID de los adjuntos son enteros secuenciales, lo que hace que la enumeraci\u00f3n sea trivial. La versi\u00f3n 2.2.1 corrige el problema."}], "id": "CVE-2026-33678", "lastModified": "2026-03-30T13:57:13.337", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-24T16:16:35.270", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "vikunja", "source": "cna", "vendor": "go-vikunja"}, "product": "vikunja", "vendor": "go-vikunja"}], "analysis": {"en": {"generated_at": "2026-03-30T15:22:53.988327+00:00", "value": {"mitigation_remediation": ["Upgrade Vikunja to version 2.2.1 or later.", "Verify that the installed version matches the latest patch.", "Limit user access to attachments by enforcing least\u2011privilege permissions and monitor attachment activity for unusual access patterns."], "summary": {"action": "Apply Patch", "impact": "Unauthorized Access"}, "threat_synthesis": {"affected_systems": "The flaw affects installations of the Vikunja task\u2011management platform prior to version\u202f2.2.1. Vulnerable applications include the open\u2011source self\u2011hosted system at the cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* range. Any instance running an affected software version is susceptible, regardless of deployment size.", "description_and_impact": "Vikunja\u2019s TaskAttachment.ReadOne endpoint retrieves an attachment solely by ID, ignoring the task ID in the request path. Because the permission check enforces access only to the task specified in the URL, an attacker can supply any accessible task ID and an arbitrary attachment ID. This causes the system to load an attachment that may belong to a different project, enabling authenticated users to download or delete files that they should not have access to. The weakness is a form of Insecure Direct Object Reference (CWE\u2011639).", "risk_and_exploitability": "The CVSS base score of 8.1 indicates a high\u2011severity vulnerability. EPSS is under 1%, suggesting that exploitation density is currently low, and the issue is not listed in CISA\u2019s KEV catalog. Nonetheless, the use of sequential numeric IDs makes attachment enumeration trivial, and any authenticated user can construct a request that deletes or downloads any file in the system. Attackers must first authenticate to the Vikunja instance, but no special privileges are required beyond valid credentials."}}}}, "created": "2026-03-25T11:47:07.836395+00:00", "updated": "2026-03-30T20:58:07.811903+00:00", "vendors": ["go-vikunja", "go-vikunja$PRODUCT$vikunja"]}