Security Vulnerabilities
pgAdmin 4's Webserver authentication source is intended to accept an identity asserted by the web server or reverse proxy in front of pgAdmin, delivered through the WSGI/CGI environment. WebserverAuthentication.get_user() read config.WEBSERVER_REMOTE_USER from request.environ and, when that returned nothing, fell back to reading the same name directly from the inbound HTTP request headers via request.headers.get(). An inbound HTTP header is written by whoever sends the request, so any client able to reach pgAdmin could supply that header itself and be authenticated as any username it named, including an existing Administrator, without presenting a password or any other credential. The environment lookup could also be satisfied by a client-supplied header whenever WEBSERVER_REMOTE_USER was configured to an HTTP_-prefixed or hyphenated name such as HTTP_X_FORWARDED_USER or X-Forwarded-User, since WSGI servers place inbound headers into the environment under exactly those names. Deployments are affected only when 'webserver' is enabled in AUTHENTICATION_SOURCES.
The fix distinguishes a genuine CGI/WSGI variable from a header-derived one and implicitly trusts only the former. A header-asserted identity is now accepted only when the operator explicitly opts in via WEBSERVER_REMOTE_USER_FROM_HEADER, the request arrives from a peer listed in WEBSERVER_TRUSTED_PROXIES, and, when configured, a shared secret supplied in WEBSERVER_SHARED_SECRET_HEADER matches WEBSERVER_SHARED_SECRET under a constant-time comparison. The trusted-peer check deliberately reads the real socket peer address rather than request.remote_addr, because ProxyFix rewrites the latter from the client-controlled X-Forwarded-For header and would otherwise allow an attacker to claim to be the trusted proxy. As defence in depth, login() now refuses any account whose auth_source is not 'webserver', so a misconfigured trust gate cannot be used to assume an internal or LDAP account.
This issue affects pgAdmin 4: from 6.2 before 9.18.
CVSS Score
9.3
EPSS Score
0.006
Published
2026-09-17
Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717
CVSS Score
2.6
EPSS Score
0.002
Published
2026-09-17
Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699
CVSS Score
3.7
EPSS Score
0.001
Published
2026-09-17
Dell OpenManage Server Administrator, versions prior to 11.1.0.3, contains an Improper Privilege Management vulnerability. A high privileged attacker with remote access could potentially exploit this vulnerability, leading to Elevation of privileges.
CVSS Score
7.2
EPSS Score
0.005
Published
2026-09-17
Dell OpenManage Server Administrator, versions prior to 11.1.0.3, contains a Server-Side Request Forgery (SSRF) vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Server-side request forgery.
CVSS Score
7.4
EPSS Score
0.004
Published
2026-09-17
Dell OpenManage Server Administrator, versions prior to 11.1.0.3, contains an Improper Certificate Validation vulnerability. An unauthenticated attacker with adjacent network access could potentially exploit this vulnerability, leading to Information disclosure and Information tampering.
CVSS Score
6.8
EPSS Score
0.001
Published
2026-09-17
Dell OpenManage Server Administrator, versions prior to 11.1.0.3, contains an Exposure of Sensitive Information to an Unauthorized Actor vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Information exposure.
CVSS Score
7.3
EPSS Score
0.001
Published
2026-09-17
Dell SmartFabric Manager, versions prior to 2.2.1, contains an Improper Handling of Insufficient Permissions or Privileges vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Information disclosure.
CVSS Score
3.5
EPSS Score
0.002
Published
2026-09-17
Dell SmartFabric Manager, versions prior to 2.2.1, contains an Insufficient Verification of Data Authenticity vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Elevation of privileges.
CVSS Score
8.1
EPSS Score
0.002
Published
2026-09-17
Dell OpenManage Server Administrator, versions prior to 11.1.0.3, contains an Improper Privilege Management vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Information tampering and Unauthorized access.
CVSS Score
8.1
EPSS Score
0.004
Published
2026-09-17