External storage app saves password for all users in the database (NC-SA-2021-006)

A missing condition in Nextcloud Server 19 and prior caused the external storage app to always store the users password in a recoverable format...

Attachments folder for Text app is accessible on "Files drop" and "Password protected" shares

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Calendar app returns full stacktrace when an error happens while editing appointment

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Messages can still be seen on conversation after expiring when cron is misconfigured

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nextcloudcmd incorrectly trusts bad TLS certificates

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Improper input-size validation on the user new session name

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Missing URL validation allowed RCE for the server on the Desktop client (NC-SA-2021-008)

Missing validation of URLs in Nextcloud Desktop Client 3.1.2 and earlier allowed a malicious server to execute code on the client. User interaction was required...

Reflected XSS when renaming malicious file (NC-SA-2021-005)

Missing sanitization in Nextcloud Server 20.0.5 and prior allowed to perform a reflected XSS when saving html as file name and causing an error on rename e.g. by renaming to an existing file. The risk is mostly mitigated due to the strict Content-Security-Policy CSP of Nextcloud, and thus mainly...

Message Authentication Codes calculated by the Default Encryption Module allow an attacker to silently overwrite blocks in a file (NC-SA-2020-038)

A wrong generation of the passphrase for the encrypted block in Nextcloud Server 19.0.1 allowed an attacker to overwrite blocks in a file...

Missing ownership check on remote wipe endpoint (NC-SA-2020-018)

An Insecure direct object reference vulnerability in Nextcloud Server 18.0.2 allowed an attacker to remote wipe devices of other users when sending a malicious request directly to the endpoint...

Missing sanitization in iOS App allows XSS (NC-SA-2020-003)

Missing sanitization in the iOS App 2.24.4 causes an XSS when opening malicious HTML files...

2FA sessions not properly expired on password change (NC-SA-2020-001)

A bug in Nextcloud Server 15.0.2 causes pending 2FA logins to not be correctly expired when the password of the user is reset...

Creation of folders in read-only folders despite lacking permissions (NC-SA-2017-002)

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...

Log pollution can potentially lead to local HTML injection (NC-SA-2016-002)

The "download log" functionality in the admin screen is delivering the log in JSON format to the end-user. The file was delivered with an attachment disposition forcing the browser to download the document. However, Firefox running on Microsoft Windows would offer the user to open the data in the...

Code injection in Nextcloud Desktop Client for macOS

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Workflows do not require password confirmation on API level

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Self XSS when pasting HTML into Text app with Ctrl+Shift+V

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Delete permissions are not saved when creating public share

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Files Drop public link can be added as federated share

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Potential DDoS when posting long data into workflow validation rules (NC-SA-2021-001)

A missing input validation in Nextcloud Server 20.0.1 allowed users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules...

XSS through image upload of contacts using svg file (NC-SA-2020-045)

A missing file type check in Nextcloud Contacts 3.3.0 allowed a malicious user to upload malicious SVG files to perform XSS attacks...

Access control missing while viewing the attachments in the 'All boards' (NC-SA-2020-036)

Missing access control in Nextcloud Deck 1.0.4 caused an insecure direct object reference allowing an attacker to view all attachments...

User IDs and Nextcloud server leaked to Nextcloud Lookup server with disabled settings (NC-SA-2019-016)

Exposure of Private Information in Nextcloud Server 16.0.1 causes the server to send it's domain and user IDs to the Nextcloud Lookup Server without any further data when the Lookup server is disabled...

Second factor authentication bypassed if provider fails to load (NC-SA-2018-011)

Missing state would not enforce the use of a second factor at login if the the provider of the second factor failed to load...

SMB User Authentication Bypass (NC-SA-2016-006)

Nextcloud includes an optional and not by default enabled SMB authentication component that allows to authenticate users against an SMB server.This backend is implemented in a way that it tries to connect to a SMB server and if that succeeded consider the user logged-in.The backend did not proper...

Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share owner

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Insecure temporary file creation, race with write access and permission

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Event create can create attachments that link to other websites

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Missing rate limiting on password reset functionality allows sending lots of emails

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Vulnerable moment-timezone version shipped

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Missing length validation of user displayname allows to generate an SQL error

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Nextcloud Server shipped insecure Archive_Tar version

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Improper confidentiality protection of server-side encryption keys (NC-SA-2020-040)

Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the public key to decrypt them later on...

Password of share by mail is not hashed when given on the create share call (NC-SA-2020-026)

A logic error in Nextcloud Server 19.0.0 caused a plaintext storage of the share password when it was given on the initial create API call...

Reflected XSS in error pages (NC-SA-2017-008)

Inadequate escaping of error messages leads to XSS vulnerabilities in multiple components.Note that Nextcloud employs a strict Content-Security-Policy preventing exploitation of this XSS issue on modern web browsers...

Server-Side Request Forgery (SSRF) in Mail app

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Ratelimit not applied on OCS API responses

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Increase random used for encryption (NC-SA-2020-023)

A too small set of random characters being used for encryption in Nextcloud Server 18.0.4 allowed decryption in shorter time than intended...

New users can read all Nextcloud Deck data from previous user with same username (NC-SA-2021-007)

A logic error in Nextcloud Deck 1.0.1 allowed new users with a duplicate user identifier to use deck data of a previous deleted user...

XSS in Desktop Client via user status and information

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Federated share accepting/declining is not logged in audit log

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Malicious Android application can crash the Nextcloud Android Client

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Sensitive data may not be removed from storage on account removal

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Downgrade encryption scheme and break integrity through known-plaintext attack (NC-SA-2020-039)

A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files...

Secure view shares can be downloaded by manipulating the URL (NC-SA-2020-015)

A missing access control check in Nextcloud Server 18.0.0 causes hide-download shares to be downloadable when appending /download to the URL...

Improper validation of permissions (NC-SA-2018-010)

Improper revalidation of permissions lead to not accepting access restrictions by acess tokens...

Content-Spoofing in "files" app (NC-SA-2017-006)

The top navigation bar displayed in the files list contained partially user-controllable input leading to a potential misrepresentation of information...

App PIN code can be bypassed in Files iOS

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XSS in Desktop Client in call notification popup

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Clear text storage of proxy parameters and passwords (NC-SA-2020-031)

A cleartext storage of sensitive information in Nextcloud Desktop Client 2.6.4 gave away information about used proxies and their authentication credentials...