CVE-2026-119755
HighCVSS 7.5Summary
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.
Risk Assessment
An attacker can alter the Tasmota device's network configuration, MQTT, settings, or firmware, potentially leading to device takeover or malware injection. The risk affects devices without a WebPassword set.
Recommendation
Upgrade Tasmota to a version containing commit 1cb7ebc or later and set a WebPassword on all devices. Restrict administrative access to devices to trusted networks.
Other vulnerabilities in Tasmota
See all- CVE-2026-119756Critical
Tasmota through 16.0.0 (fixed in commit e97e1e4) contains a heap out-of-bounds write in SendReceiveDeviceGroupMessage() that allows unauthenticated attackers on the local network to corrupt heap memory by sending crafted Device Groups messages over UDP port 4447. The messages cause the log_remaining counter to go negative and writes to exceed the fixed 512-byte buffer. This can crash the device or potentially achieve native code execution on ESP8266 and ESP32 platforms lacking ASLR and heap cookies.
- CVE-2026-38427High
Tasmota versions up to 15.3.0.3 contain an issue in the fetch_jpg() function that allows a remote attacker to cause a heap buffer overflow. The Content-Length from a JPEG stream is stored in a uint16_t variable, leading to allocation of a smaller buffer than the data actually read when the value exceeds 65535.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS