Bypass lock protection in Android app (NC-SA-2019-006)

If an attacker has physical access to an Android smartphone without a screen lock, but with nextcloud installed and set up, they can easily access the nextcloud-files even if the nextcloud app is locked with a fingerprint or pin...

Bypass lock protection in Android app (NC-SA-2019-008)

If an attacker has physical access to an Android smartphone without a screen lock, but with nextcloud installed and set up, they can circumvent the passcode protection by repeatedly opening and closing the app in a very short time...

Thumbnails of files leaked via Android content provider (NC-SA-2019-007)

If an attacker has physical access to an Android smartphone without a screen lock, but with nextcloud installed and set up, he can easily access the nextcloud-files even if the nextcloud app is locked with a fingerprint or pin...

Improper check for access to application database (NC-SA-2018-015)

A too permissive check allowed an installed application that contained the Nextcloud client package name to obtain access to the database of the Nextcloud application. At time of disclosure there are no applications with in the Google Play Store that fullfill this requirement...

Nextcloud: Clickjacking on https://download.nextcloud.com

This page is vulnerable to clickjacking https://download.nextcloud.com Steps to Reproduce: 1. Copy the following code and save it as clickjacking.html Clickjack test page Website is vulnerable to clickjacking! 2. Open it in browser You can see the website is vulnerable to clickjacking Impact Anyo...

Nextcloud: User can delete data in shared folders he's not autorized to access

Steps to reproduce 1. create a group folder named TEST and share with "admin group" and "test group", marking the advanced permission flag 2. create two folders inside the main share: visible and invisible 3. inside "invisible" folder create a test file let's say something like "test.txt" 4. set...

Server-Side request forgery in New-Subscription feature of the calendar app (NC-SA-2019-014)

An authenticated server-side request forgery in Nextcloud server 16.0.1 allowed to detect local and remote services when adding a new subscription in the calendar application...

Nextcloud: Code injection in macOS Desktop Client

Vulnerability description I've identified a code injection vulnerability in your macOS desktop client. Any malicious application, running with standard user permissions is able to exploit this vulnerability and execute code in your application's context. Requirements In order to exploit this...

Nextcloud: Delete permission can be added on reshare

user0 creates folder /test user0 creates file /test/file.txt user0 shares folder /test with user1 with read+share permissions 17 user1 receives the folder /test and can read-download /test/file.txt but not delete - good user1 uses the sharing API to share folder /test with user2, and specifies...

Nextcloud: Some HTML Tags are Getting Executed in com.nextcloud.client

What is the Vulnerability? HTML Tags such as , , and are Getting Executed in Next Cloud Client Mobile Application for Android which can then Results to Code Injection. Reproduction Steps 1. Using Next Cloud Client Mobile App on Android, Rename a Folder to test Our HTML tag Was Executed F518303...

Nextcloud: Passcode Protection in Android Devices Can be Bypassed.

What is The Vulnerability? The Passcode can be bypassed by calling a MainLoginActivity which is com.owncloud.android.ui.activity.FileDisplayActivity , We have successfully bypassed the passcode and are redirected to the App's User Interface. of the user’s credentials: Android Version: 9 Non Roote...

Improper permission preservation on reshares (NC-SA-2020-012)

Improper permissions preservation in Nextcloud Server 16.0.1 causes sharees to be able to reshare with write permissions when sharing the mount point of a share they received, as a public link...

Nextcloud: CSRF vulnerability that allows an attacker to modify encryption settings

The POST request to /ocs/v2.php/apps/provisioningapi/api/v1/config/apps/core/encryptionenabled is missing a unique token, so that if an attack can trick an admin user with an active session to visit an attacker controlled website, he/she can control the core application setting "encryptionenabled...

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...

Nextcloud: Wordpress Users Disclosure

Information Using REST API, we can see all the WordPress users/author with some of their information. Step to Reproduce You can get user info by entering below url in your browser: https://nextcloud.com/wp-json/wp/v2/users Reference: 356047 Impact Authors : LTR , LTREditor can be created scenario...

Nextcloud: Arbitrary code execution in desktop client via OpenSSL config

Summary: The nextcloud windows desktop application utilizes a precompiled OpenSSL library called libeay32.dll. This OpenSSL library attempts to load c:\usr\local\ssl\openssl.cnf when the nextcloud windows application is launched. The c:\usr\local\ssl\openssl.cnf file does not exist. By default, o...

Nextcloud: User with read-only access to a share can gain write access to sub-folders in the share

user0 creates folders /test and /test/sub user0 creates file /test/sub/file.txt user0 shares folder /test with user1 with read+share permissions 17 user1 receives the folder /test and can read-download /test/sub/file.txt - good user1 creates a link share of /test/sub - it has permissions 1...

Nextcloud: Reflected XSS / Markup Injection in `index.php/svg/core/logo/logo` parameter `color`

I just found a reflected Cross-Site Scripting XSS vulnerability in Nextcloud Server that affects current stable and dates back to at least 15.0.5. The vulnerability seems mitigated by a Content-Security-Policy CSP, but there might be a residual risk for phishing, due to the CSP's lack of a...

Extract add-on for Nextcloud OS Command Injection Vulnerability

Extract add-on for Nextcloud is a set of component applications for Netcloud. An input validation vulnerability exists in Extract add-on for Nextcloud lib/Controller/ExtractionController.php, which allows remote attackers to submit a special request that can be used to execute arbitrary OS comman...

Nextcloud Extract App OS Command Injection Vulnerability

Nextcloud is an open source self-hosted file synchronization and sharing communication application platform from Nextcloud, Germany.Extract App is one of the compressed file extractor. An operating system command injection vulnerability exists in Nextcloud Extract App versions prior to 1.2.0. The...