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CVSS: 5.4EPSS: 0%CPEs: 1EXPL: 0

Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue. Nextcloud Server anterior a 11.0.3 es vulnerable a un escape inadecuado lo que produce una vulnerabilidad XSS en el módulo de búsqueda. Para ser explotable un usuario tiene que escribir o pegar contenido malicioso en el diálogo de búsqueda. • https://hackerone.com/reports/213227 https://nextcloud.com/security/advisory/?id=nc-sa-2017-007 • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •

CVSS: 5.4EPSS: 0%CPEs: 3EXPL: 0

Nextcloud Server before 9.0.58 and 10.0.5 and 11.0.3 are shipping a vulnerable JavaScript library for sanitizing untrusted user-input which suffered from a XSS vulnerability caused by a behaviour change in Safari 10.1 and 10.2. Note that Nextcloud employs a strict Content-Security-Policy preventing exploitation of this XSS issue on modern web browsers. Nextcloud Server anterior a 9.0.58, a 10.0.5, y a 11.0.3 utiliza una biblioteca de JavaScript vulnerable para desinfectar la entrada de usuario no confiable que sufrió una vulnerabilidad XSS causada por un cambio de comportamiento en Safari 10.1 y 10.2. Tenga en cuenta que Nextcloud emplea una estricta política de seguridad de contenido que impide la explotación de este problema XSS en los navegadores web modernos. • https://hackerone.com/reports/222838 https://nextcloud.com/security/advisory/?id=nc-sa-2017-010 • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •

CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a Denial of Service attack. Due to an error in the application logic an authenticated adversary may trigger an endless recursion in the application leading to a potential Denial of Service. Nextcloud Server en versiones anteriores a 9.0.55 y 10.0.2 sufre de un ataque de denegación de servicio. Debido a un error en la lógica de la aplicación, un adversario autenticado puede desencadenar una recursión interminable en la aplicación que conduce a una posible denegación de servicio. • https://hackerone.com/reports/174524 https://nextcloud.com/security/advisory/?id=nc-sa-2017-004 • CWE-674: Uncontrolled Recursion •

CVSS: 4.3EPSS: 0%CPEs: 2EXPL: 0

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a creation of folders in read-only folders despite lacking permissions issue. Due to a logical error in the file caching layer an authenticated adversary is able to create empty folders inside a shared folder. Note that this only affects folders and files that the adversary has at least read-only permissions for. Nextcloud Server en versiones anteriores a 9.0.55 y 10.0.2 sufre de una creación de carpetas en carpetas de sólo lectura a pesar del problema de permisos que faltan. Debido a un error lógico en la capa de caché de archivos, un adversario autenticado puede crear carpetas vacías dentro de una carpeta compartida. • https://hackerone.com/reports/169680 https://nextcloud.com/security/advisory/?id=nc-sa-2017-002 • CWE-275: Permission Issues CWE-732: Incorrect Permission Assignment for Critical Resource •

CVSS: 6.4EPSS: 0%CPEs: 2EXPL: 0

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue. A permission related issue within the OCS sharing API allowed an authenticated adversary to reshare shared files with an increasing permission set. This may allow an attacker to edit files in a share despite having only a 'read' permission set. Note that this only affects folders and files that the adversary has at least read-only permissions for. Nextcloud Server en versiones anteriores a 9.0.55 y 10.0.2 sufre un aumento de permiso al volver a compartir a través del problema de la API de OCS compartiendo API permitió a un adversario autenticado compartir archivos compartidos con un conjunto de permisos creciente. • https://hackerone.com/reports/169680 https://nextcloud.com/security/advisory/?id=nc-sa-2017-001 • CWE-275: Permission Issues CWE-732: Incorrect Permission Assignment for Critical Resource •