Bypass of image blocking in Nextcloud Mail

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Lack of ratelimit on public DAV endpoint

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Lack of ratelimit on shareinfo endpoint

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Nextcloud Talk not properly disassociating users from chats after account deletion

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Application specific tokens can change their own scope

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Audit log is not properly logging unsetting of share expiration date

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Filenames not escaped by default in controllers using DownloadResponse

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Ratelimit not applied on OCS API responses

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CVE-2021-32734: Generation of Error Message Containing Sensitive Information

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, the Nextcloud Text application shipped with Nextcloud Server returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. The issu...

CVE-2021-32733: Improper Neutralization of Input During Web Page Generation

Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a text/html Content-Type when serving files to...

CVE-2021-32727: Improper Certificate Validation

Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private...

CVE-2021-32726: Incorrect Ownership Assignment

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fix...

CVE-2021-32725: Insecure Inherited Permissions

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, default share permissions were not being respected for federated reshares of files and folders. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known...

CVE-2021-32707: Improper Input Validation

Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a background-image CSS attribute. Note that the images were still passed...

CVE-2021-32689: Incorrect Ownership Assignment

Nextcloud Talk is a fully on-premises audio/video and chat communication service. In versions prior to 11.2.2, if a user was able to reuse an earlier used username, they could get access to any chat message sent to the previous user with this username. The issue was patched in versions 11.2.2 and...

CVE-2021-32705: Improper Control of Interaction Frequency

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public DAV endpoint. This may have allowed an attacker to enumerate potentially valid share tokens or credentials. The issue was fixed in...

CVE-2021-32703: Improper Control of Interaction Frequency

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the shareinfo endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in versions 19.0.13,...

CVE-2021-32688: Improper Authorization

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications e.g. DAV sync clients, and can also be configured by the user to not have any...

PT-2021-19893

Name of the Vulnerable Software and Affected Versions Nextcloud Text versions prior to 19.0.13 Nextcloud Text versions prior to 20.0.11 Nextcloud Text versions prior to 21.0.3 Description A cross-site scripting issue is present in the Nextcloud Text application. The application uses a text/html...

PT-2021-19898

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions prior to 19.0.13 Nextcloud Server versions prior to 20.0.11 Nextcloud Server versions prior to 21.0.3 Description The issue is related to a lack of ratelimiting on the public share link mount endpoint, which may have...