CVE-2021-39220 Bypass of image blocking in Nextcloud Mail

Nextcloud is an open-source, self-hosted productivity platform The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol. It is recommend...

CVE-2021-39220

Summary: CVE-2021-39220 affects the Nextcloud Mail application. The issue is an information-disclosure due to a privacy filter that fails to filter images using relative protocols, allowing leakage of read state or user IP. Affected versions: Nextcloud Mail prior to 1.10.4 and 1.11.0. Root cause:...

CVE-2021-39220

Nextcloud is an open-source, self-hosted productivity platform The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol. It is recommend...

Two-Factor Authentication not enforced for pages marked as public

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File Traversal affecting SVG files on Nextcloud Server

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Rate-limits not working on instances without configured memory cache backend

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Missing permission check on Deck API

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Nextcloud Server shipped insecure Archive_Tar version

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Missing User Presence Check in Nextcloud WebAuthn login

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File path disclosure of shared files in OfficeOnline application

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File path disclosure of shared files in Richdocuments application

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XSS in Contacts

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XSS in Talk

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Bypass of image blocking in Nextcloud Mail

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CVE-2021-41179: Missing Critical Step in Authentication

Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasn't enforced for pages marked as public. Any page marked as @PublicPage could thus be accessed with a valid user session that isn't...

CVE-2021-41178: Relative Path Traversal

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishi...

CVE-2021-41177: Improper Control of Interaction Frequency

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits as as AnonRateThrottle or UserRateThrottle was thus not rat...

CVE-2021-39224: Exposure of Sensitive Information to an Unauthorized Actor

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. e.g. an attacker could see that the file shared.txt is locat...

CVE-2021-39225: Authorization Bypass Through User-Controlled Key

Nextcloud is an open-source, self-hosted productivity platform. A missing permission check in Nextcloud Deck before 1.2.9, 1.4.5 and 1.5.3 allows another authenticated users to access Deck cards of another user. It is recommended that the Nextcloud Deck App is upgraded to 1.2.9, 1.4.5 or 1.5.3...

CVE-2021-39223: Exposure of Sensitive Information to an Unauthorized Actor

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. e.g. an attacker could see that the file...