CVE-2026-28506

{"id": "CVE-2026-28506", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "published": "2026-03-17T16:16:20.940", "references": [{"url": "https://github.com/outline/outline/security/advisories/GHSA-69x7-6fcr-mm6g", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-200"}]}], "descriptions": [{"lang": "en", "value": "Outline is a service that allows for collaborative documentation. Prior to 1.5.0, the events.list API endpoint, used for retrieving activity logs, contains a logic flaw in its filtering mechanism. It allows any authenticated user to retrieve activity events associated with documents that have no collection (e.g., Private Drafts, Deleted Documents), regardless of the user's actual permissions on those documents. While the document content is not directly exposed, this vulnerability leaks sensitive metadata (such as Document IDs, user activity timestamps, and in some specific cases like the Document Title of Permanent Delete). Crucially, leaking valid Document IDs of deleted drafts removes the protection of UUID randomness, making High-severity IDOR attacks (such as the one identified in documents.restore) trivially exploitable by lowering the attack complexity. Version 1.5.0 fixes the issue."}, {"lang": "es", "value": "Outline es un servicio que permite la documentaci\u00f3n colaborativa. Antes de la versi\u00f3n 1.5.0, el endpoint de la API events.list, utilizado para recuperar registros de actividad, contiene un fallo l\u00f3gico en su mecanismo de filtrado. Permite a cualquier usuario autenticado recuperar eventos de actividad asociados con documentos que no tienen colecci\u00f3n (por ejemplo, Borradores Privados, Documentos Eliminados), independientemente de los permisos reales del usuario sobre esos documentos. Aunque el contenido del documento no se expone directamente, esta vulnerabilidad filtra metadatos sensibles (como IDs de Documentos, marcas de tiempo de actividad del usuario, y en algunos casos espec\u00edficos como el T\u00edtulo del Documento de Eliminaci\u00f3n Permanente). Fundamentalmente, la filtraci\u00f3n de IDs de Documentos v\u00e1lidos de borradores eliminados elimina la protecci\u00f3n de la aleatoriedad de los UUID, haciendo que los ataques IDOR de alta severidad (como el identificado en documents.restore) sean trivialmente explotables al reducir la complejidad del ataque. La versi\u00f3n 1.5.0 corrige el problema."}], "lastModified": "2026-03-19T19:32:27.067", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FD272F5C-5BF0-4CB5-A2AC-169718EEFCBE", "versionEndExcluding": "1.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}