CVE-2026-4193 D-Link DIR-823G goahead UpdateClientInfo access control
Remote attackers can bypass access controls on multiple router settings functions in the unsupported D-Link DIR-823G, allowing unauthorized configuration changes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4193?
CVE-2026-4193 is a medium-severity missing authorization vulnerability in Dlink Dir-823g Firmware, published on 15 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in D-Link DIR-823G 1.0.2B05. The affected element is the function GetDDNSSettings/GetDeviceDomainName/GetDeviceSettings/GetDMZSettings/GetFirewallSettings/GetGuestNetworkSettings/GetLanWanConflictInfo/GetLocalMacAddress/GetNetworkSettings/GetQoSSettings/GetRouterInformationSettings/GetRouterLanSettings/GetWanSettings/SetAccessCtlList/SetAccessCtlSwitch/SetDeviceSettings/SetGuestWLanSettings/SetIPv4FirewallSettings/SetNetworkSettings/SetNetworkTomographySettings/SetNTPServerSettings/SetRouterLanSettings/SetStaticClientInfo/SetStaticRouteSettings/SetWLanRadioSecurity/SetWPSSettings/UpdateClientInfo of the component goahead. Such manipulation leads to improper access controls. The attack may be launched remotely. The exploit has been disclosed publicly and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
Which versions are affected by CVE-2026-4193?
It affects 1 product.
Products include Dlink Dir-823g Firmware.
How do I fix CVE-2026-4193?
No fix has been published for CVE-2026-4193 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4193 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4193 exists.
Other vulnerabilities in Dlink Dir-823g Firmware
Sources
Also known as GHSA-4f7r-xrwr-q63x.