CVE-2023-39954

user_oidc app stores client secret unencrypted in database

user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, an attacker that obtained at least read access to a snapshot of the database can impersonate the Nextcloud server towards linked servers. user_oidc 1.3.3 contains a patch. No known workarounds are available.

CVSS 3.1 · 3.8 Low EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

User Oidc

CVE-2023-39953

Issuer not verified from obtained token in user_oidc

user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

User Oidc

CVE-2023-39952

Advanced permissions not respected when copying entire group folders

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Nextcloud Server

CVE-2023-35927

Nextcloud system addressbooks can be modified by malicious trusted server

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again. Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. Remove all trusted servers in the "Administration" > "Sharing" settings `…/index.php/settings/admin/sharing`. Afterwards, trigger a recreation of the local system addressbook with the following `occ dav:sync-system-addressbook`.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Nextcloud Server

CVE-2023-35173

End-to-End encrypted file-drops can be made inaccessible

Nextcloud End-to-end encryption app provides all the necessary APIs to implement End-to-End encryption on the client side. By providing an invalid meta data file, an attacker can make previously dropped files inaccessible. It is recommended that the Nextcloud End-to-end encryption app is upgraded to version 1.12.4 that contains the fix.

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

End-to-end Encryption

CVE-2023-35171

Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. Starting in version 26.0.0 and prior to version 26.0.2, an attacker could supply a URL that redirects an unsuspecting victim from a legitimate domain to an attacker's site. Nextcloud Server and Nextcloud Enterprise Server 26.0.2 contain a patch for this issue. No known workarounds are available.

CVSS 3.1 · 4.1 Medium EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Nextcloud Server

CVE-2021-41256

Intent URI permissions manipulation in nextcloud news-android

nextcloud news-android is an Android client for the Nextcloud news/feed reader app. In affected versions the Nextcloud News for Android app has a security issue by which a malicious application installed on the same device can send it an arbitrary Intent that gets reflected back, unintentionally giving read and write access to non-exported Content Providers in Nextcloud News for Android. Users should upgrade to version 0.9.9.63 or higher as soon as possible.

CVSS 3.1 · 5.8 Medium EPSS 1.1% KEV · Not listed

Vendors

Nextcloud

Products

News

CVE-2021-41179

Two-Factor Authentication not enforced for pages marked as public

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 authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed

Vendors

Nextcloud

Products

Server

CVE-2021-41178

File Traversal affecting SVG files on Nextcloud Server

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/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

CVSS 3.1 · 8.8 High EPSS 1.8% KEV · Not listed

Vendors

Nextcloud

Products

Server

CVE-2021-41177

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

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 rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.

CVSS 3.1 · 8.1 High EPSS 1.6% KEV · Not listed

Vendors

Nextcloud

Products

Nextcloud Server

CVE-2021-39225

Missing permission check on Deck API

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. There are no known workarounds aside from upgrading.

CVSS 3.1 · 8.1 High EPSS 1.3% KEV · Not listed

Vendors

Nextcloud

Products

Deck

CVE-2021-39224

File path disclosure of shared files in OfficeOnline application

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 located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.

CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Officeonline

CVE-2021-39223

File path disclosure of shared files in Richdocuments application

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 `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.

CVSS 3.1 · 4.8 Medium EPSS 1.1% KEV · Not listed

Vendors

Nextcloud

Products

Richdocuments

CVE-2021-39222

XSS in Talk

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

CVSS 3.1 · 6.4 Medium EPSS 1.1% KEV · Not listed

Vendors

Nextcloud

Products

Talk

CVE-2021-39221

XSS in Contacts

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Contacts

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 recommended that the Nextcloud Mail application is upgraded to 1.10.4 or 1.11.0. There are no known workarounds aside from upgrading.

CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed

Vendors

Nextcloud

Products

Mail

CVE-2021-37631

Circle can be accessed by non-Circle members in Nextcloud Deck

Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. In affected versions the Deck application didn't properly check membership of users in a Circle. This allowed other users in the instance to gain access to boards that have been shared with a Circle, even if the user was not a member of the circle. It is recommended that Nextcloud Deck is upgraded to 1.5.1, 1.4.4 or 1.2.9. If you are unable to update it is advised to disable the Deck plugin.

CVSS 3.1 · 6.5 Medium EPSS 1.3% KEV · Not listed

Vendors

Nextcloud

Products

Deck

CVE-2021-37630

Secret Circle can be joined without approval in Nextcloud Circles

Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application allowed any user to join any "Secret Circle" without approval by the Circle owner leaking private information. It is recommended that Nextcloud Circles is upgraded to 0.19.15, 0.20.11 or 0.21.4. There are no workarounds for this issue.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed

Vendors

Nextcloud

Products

Circles

CVE-2021-37629

Lack of ratelimit on Richdocuments OCS endpoint in nextcloud

Nextcloud Richdocuments is an open source collaborative office suite. In affected versions there is a lack of rate limiting on the Richdocuments OCS endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. It is recommended that the Nextcloud Richdocuments app is upgraded to either 3.8.4 or 4.2.1 to resolve. For users unable to upgrade it is recommended that the Richdocuments application be disabled.

CVSS 3.1 · 5.3 Medium EPSS 1.4% KEV · Not listed

Vendors

Nextcloud

Products

Richdocuments

CVE-2021-37628

File Drop can be bypassed using Richdocuments app in nextcloud

Nextcloud Richdocuments is an open source collaborative office suite. In affected versions the File Drop features ("Upload Only" public link shares in Nextcloud) can be bypassed using the Nextcloud Richdocuments app. An attacker was able to read arbitrary files in such a share. It is recommended that the Nextcloud Richdocuments is upgraded to 3.8.4 or 4.2.1. If upgrading is not possible then it is recommended to disable the Richdocuments application.

CVSS 3.1 · 7.5 High EPSS 2.1% KEV · Not listed

Vendors

Nextcloud

Products

Richdocuments