4.3
MEDIUM
CVE-2021-22896
Nextcloud Mail Authentication Bypass
Description

Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.

INFO

Published Date :

June 11, 2021, 4:15 p.m.

Last Modified :

June 22, 2021, 1:03 a.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-22896 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Nextcloud nextcloud_server
2 Nextcloud nextcloud
3 Nextcloud notes
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-22896.

URL Resource
https://github.com/nextcloud/mail/pull/4864 Patch Third Party Advisory
https://github.com/nextcloud/mail/releases/tag/v1.9.5 Release Notes Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3 Third Party Advisory
https://hackerone.com/reports/1129996 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-22896 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-22896 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jun. 22, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
    Changed Reference Type https://github.com/nextcloud/mail/pull/4864 No Types Assigned https://github.com/nextcloud/mail/pull/4864 Patch, Third Party Advisory
    Changed Reference Type https://github.com/nextcloud/mail/releases/tag/v1.9.5 No Types Assigned https://github.com/nextcloud/mail/releases/tag/v1.9.5 Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3 No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3 Third Party Advisory
    Changed Reference Type https://hackerone.com/reports/1129996 No Types Assigned https://hackerone.com/reports/1129996 Third Party Advisory
    Added CWE NIST CWE-862
    Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:* versions up to (excluding) 1.9.5
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-22896 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-22896 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.09 }} 0.03%

score

0.38077

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability