Tasmota: Cross-site request forgery via Referer header bypass (CVE-2026-119755)

hello@craftedsignal.io — Mon, 09 Nov 2026 19:51:03 +0000

Tasmota through 16.0.0, fixed in commit 1cb7ebc, contains a cross-site request forgery vulnerability that allows unauthenticated attackers to bypass Referer-based CSRF protection in HttpCheckPriviledgedAccess() by crafting a Referer header where the device hostname or IP appears as a substring immediately after http://.evil.com/. Attackers can lure an administrator on the device's network to a malicious page to issue arbitrary console commands and reconfigure Wi-Fi, MQTT, settings, or firmware on devices lacking a WebPassword. The CVSS v3.1 base score is 7.5.

Tasmota: Heap out-of-bounds write in SendReceiveDeviceGroupMessage (CVE-2026-119756)

hello@craftedsignal.io — Mon, 09 Nov 2026 19:50:51 +0000

Tasmota through 16.0.0, fixed in commit e97e1e4, contains a heap out-of-bounds write vulnerability in SendReceiveDeviceGroupMessage() that allows unauthenticated attackers on the local network to corrupt heap memory by sending crafted Device Groups messages over UDP port 4447. This causes the log_remaining counter to go negative and writes to exceed the fixed 512-byte buffer. Attackers can exploit this flaw to crash the device or potentially achieve native code execution on ESP8266 and ESP32 platforms.

Tasmota (<= 16.0.0) - CraftedSignal Threat Feed

Tasmota: Cross-site request forgery via Referer header bypass (CVE-2026-119755)

Tasmota: Heap out-of-bounds write in SendReceiveDeviceGroupMessage (CVE-2026-119756)