Vulnerabilities

CVE-2026-19586 is a pre-authentication OS command injection flaw (CWE-78) in TP-Link Omada business gateways when they are configured to operate as an OpenVPN Server, caused by insufficient validation of client-supplied data during OpenVPN connection establishment. An unauthenticated remote attacker who can reach the VPN service can send specially crafted input during a connection attempt to influence backend command execution before authentication completes, gaining arbitrary command execution and potentially full compromise of the gateway, which typically sits at the network edge controlling routing and VPN for the whole site. Affected organizations are those running any of the listed Omada gateway models with the OpenVPN Server feature enabled and reachable by the attacker. TP-Link rates the issue critical (CVSS 4.0 base score 9.3). A public technical write-up/PoC exists and EPSS assigns a 5.7% probability of exploitation within 30 days (93rd percentile), but exploitation has not yet been confirmed in the wild and the flaw is not in CISA KEV.

Do: Update all listed Omada gateway models to the latest firmware per TP-Link's security advisory (fixed version numbers are not specified in the available data, so check the advisory for affected/fixed ranges). Until patched, disable OpenVPN Server or restrict access to the VPN service (e.g., firewall/ACL rules limiting UDP 1194 to trusted sources). Inventory your estate for these gateway models, confirm whether OpenVPN Server is enabled and reachable, and review VPN logs for anomalous connection attempts.

TP-Link Tapo C120 (v1) and Tapo C200 (v5) cameras contain an improper authentication vulnerability (CWE-287) in the login authentication verification module, rated high severity at CVSS 4.0 8.7. An attacker already present on the same local network as the camera (adjacent-network attack vector) can exploit weak validation of challenge parameters during the login handshake to bypass normal authentication and obtain administrative session tokens. With these tokens, the attacker can perform privileged management actions, gain unauthorized administrative access to the camera, and temporarily disrupt device services, causing a denial-of-service condition. All consumer and small-business deployments of these specific camera hardware/firmware versions are affected. A public proof-of-concept exists on GitHub, but EPSS is low (0.3% in 30 days) and the flaw is not in the CISA KEV catalog, so exploitation in the wild is not currently observed.

Do: Check the hardware/firmware version of any Tapo C120 or C200 units in your environment (Tapo app > device settings > firmware) and apply the latest firmware TP-Link publishes for these models as soon as a fix is available, monitoring TP-Link's security advisory page. Because exploitation requires local network access, place cameras on a segregated IoT/guest VLAN that cannot reach trusted internal segments, and verify camera accounts, bindings, and recorded footage for signs of unauthorized administrative access.