Armendgashi

**Nome do software vulnerável e versões afetadas** Versões do Nextcloud Notes anteriores à 4.9.3 **Descrição** O problema está relacionado à possibilidade de compartilhar uma pasta chamada `Notes/` com um usuário recém-criado antes que ele faça login, permitindo que um invasor remoto acesse informações confidenciais. **Recomendações** Para versões anteriores à 4.9.3, atualize o aplicativo Nextcloud Notes para a versão 4.9.3 para resolver o problema. Como solução temporária, considere restringir o acesso à pasta `Notes/` para minimizar o risco de exploração.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Mail versions 1.13.0 through 2.2.7 Nextcloud Mail versions 2.2.8 is not affected, but versions prior to 3.3.0 are affected, so the correct range is: Nextcloud Mail versions 1.13.0 through 3.2.x **Description** Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. An attacker can use an unprotected endpoint in the Mail app to perform a Server-Side Request Forgery (SSRF) attack. **Recommendations** For Nextcloud Mail versions 1.13.0 through 2.2.7, update to version 2.2.8 or later. For Nextcloud Mail versions prior to 3.3.0, update to version 3.3.0. As a temporary workaround for all affected versions, consider disabling the mail app.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions 25.0.0 through 25.0.12 Nextcloud Server versions 26.0.0 through 26.0.7 Nextcloud Server versions prior to 27.1.3 Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.15 Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12 Nextcloud Enterprise Server versions 22.2.0 through 22.2.10.14 Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.11 Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.7 **Description** The issue is related to the possibility of updating any personal or global external storage, making it inaccessible for everyone else. This can be exploited by a malicious user to bypass existing access restriction policies. **Recommendations** For Nextcloud Server versions 25.0.0 through 25.0.12, update to version 25.0.13 or later. For Nextcloud Server versions 26.0.0 through 26.0.7, update to version 26.0.8 or later. For Nextcloud Server versions prior to 27.1.3, update to version 27.1.3 or later. For Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.15, update to version 20.0.14.16 or later. For Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12, update to version 21.0.9.13 or later. For Nextcloud Enterprise Server versions 22.2.0 through 22.2.10.14, update to version 22.2.10.15 or later. For Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.11, update to version 23.0.12.12 or later. For Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.7, update to version 24.0.12.8 or later. As a temporary workaround, consider disabling the app `files external` to retain configurations until a patched version has been deployed.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions 25.0.0 through 25.0.12 Nextcloud Server versions 26.0.0 through 26.0.7 Nextcloud Server versions 27.0.0 through 27.1.2 **Description** The issue is related to improper neutralization of input during web page generation, which can allow a remote attacker to perform cross-site scripting (XSS) attacks. An attacker could insert links into circle names that would be opened when clicking the circle name in a search filter. **Recommendations** For Nextcloud Server versions 25.0.0 through 25.0.12, update to version 25.0.13 or later. For Nextcloud Server versions 26.0.0 through 26.0.7, update to version 26.0.8 or later. For Nextcloud Server versions 27.0.0 through 27.1.2, update to version 27.1.3 or later. As a temporary workaround, consider disabling the app circles to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Mail versions prior to 2.2.8 Nextcloud Mail versions prior to 3.3.0 **Description** The issue is related to a missing check of origin, target, and cookies in Nextcloud Mail, allowing an attacker to abuse the proxy endpoint and cause a denial of service to a third server. **Recommendations** For versions prior to 2.2.8, upgrade to 2.2.8. For versions prior to 3.3.0, upgrade to 3.3.0. As a temporary workaround, consider restricting access to the proxy endpoint until a patch is available.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions 25.0.0 through 25.0.7 Nextcloud Server versions 26.0.0 through 26.0.2 Nextcloud Enterprise Server versions 19.0.0 through 19.0.13.9 Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.14 Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12 Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.12 Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.7 Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.2 Nextcloud Enterprise Server versions 25.0.0 through 25.0.7 Nextcloud Enterprise Server versions 26.0.0 through 26.0.2 **Description** The issue is related to the external storage functionality at the user level, which can be used to collect login credentials of other users. This can allow a remote attacker to gain access to another user's account. **Recommendations** For Nextcloud Server versions 25.0.0 through 25.0.7 and 26.0.0 through 26.0.2, update to version 25.0.7 or 26.0.2. For Nextcloud Enterprise Server versions 19.0.0 through 19.0.13.9, update to version 19.0.13.9. For Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.14, update to version 20.0.14.14. For Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12, update to version 21.0.9.12. For Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.12, update to version 22.2.10.12. For Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.7, update to version 23.0.12.7. For Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.2, update to version 24.0.12.2. For Nextcloud Enterprise Server versions 25.0.0 through 25.0.7, update to version 25.0.7. For Nextcloud Enterprise Server versions 26.0.0 through 26.0.2, update to version 26.0.2. As a temporary workaround, consider disabling the app `files external`. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.