CVE-2024-39839
Remote username set to an arbitrary string by remote user
Severity Score
4.3
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
*Credits:
Juho Forsén
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2024-07-23 CVE Reserved
- 2024-08-01 CVE Published
- 2024-08-01 CVE Updated
- 2025-04-06 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-284: Improper Access Control
CAPEC
References (1)
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Mattermost Search vendor "Mattermost" | Mattermost Search vendor "Mattermost" for product "Mattermost" | 9.9.0 Search vendor "Mattermost" for product "Mattermost" and version "9.9.0" | en |
Affected
| ||||||
| Mattermost Search vendor "Mattermost" | Mattermost Search vendor "Mattermost" for product "Mattermost" | >= 9.5.0 <= 9.5.6 Search vendor "Mattermost" for product "Mattermost" and version " >= 9.5.0 <= 9.5.6" | en |
Affected
| ||||||
| Mattermost Search vendor "Mattermost" | Mattermost Search vendor "Mattermost" for product "Mattermost" | >= 9.7.0 <= 9.7.5 Search vendor "Mattermost" for product "Mattermost" and version " >= 9.7.0 <= 9.7.5" | en |
Affected
| ||||||
| Mattermost Search vendor "Mattermost" | Mattermost Search vendor "Mattermost" for product "Mattermost" | >= 9.8.0 <= 9.8.1 Search vendor "Mattermost" for product "Mattermost" and version " >= 9.8.0 <= 9.8.1" | en |
Affected
| ||||||