CVE-2023-3613
LowCVSS 3.5Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
The Mattermost WelcomeBot plugin fails to validate membership status when inviting or adding users to channels, allowing guest accounts to be added by default.
Risk Assessment
The organization may be exposed to unauthorized access to channels by guest accounts, potentially leading to information leaks or privacy breaches.
Recommendation
It is recommended to update the WelcomeBot plugin and implement additional membership status verification mechanisms before adding users to channels.
Related vulnerabilities
- CVE-2026-95860Critical
In node-opcua (an OPC UA implementation for TypeScript and Node.js), versions 2.42.0 through 2.180.0 do not honor namespace-level access control configured via setDefaultRolePermissions for nodes without explicit per-node permissions. SessionContext.getApplicableRolePermissions reads a missing or null value instead of the configured namespace field, and the null result is treated permissively. As a result, an anonymous network client can write variables or call bound methods when an operator relied on restrictive namespace defaults.
- CVE-2026-82158Critical
Dell Wyse Management Suite versions prior to 2609.0.0.155 contain a cross-site scripting vulnerability (improper neutralization of input during web page generation). A low-privileged attacker with remote access could exploit it to inject script.
- CVE-2026-121249Critical
Buffer overflow in ANGLE in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121247Critical
Buffer overflow in Dawn in Google Chrome on Android prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121246Critical
Use-after-free vulnerability in the WebGL component of Google Chrome on Android prior to 157.0.8103.38. A remote attacker could potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121241Critical
Use-after-free vulnerability in the Navigation component of Google Chrome on Android prior to 157.0.8103.38. A remote attacker could potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121234Critical
Privilege elevation in Contacts in Google Chrome on Android prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121229Critical
Memory corruption in ANGLE in Google Chrome on Android prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121214Critical
Use after free in Passwords in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page.
- CVE-2026-121202Critical
Use after free in Autofill in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page.
Original NVD description (English source)
Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS