CVE-2026-67405
published 2026-09-23CVE-2026-67405: RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler…
PriorityP344high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.11%
1.3th percentile
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler (deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl:104) nor the Web-STOMP handler (deps/rabbitmq_web_stomp/src/rabbit_web_stomp_handler.erl:102) validates the Origin header on the WebSocket upgrade. Under ssl_cert_login=true, the browser presents the client certificate automatically, so an attacker's JavaScript running in the victim's browser can authenticate as the victim. Preconditions include The non-default configuration use_http_auth=true (Web-STOMP) or ssl_cert_login=true (both plugins) must be enabled. The issue is harmless under the default in-band CONNECT credential configuration.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| broadcom | rabbitmq_server | >= 3.13.0 < 3.13.15 | 3.13.15 |
| broadcom | rabbitmq_server | >= 4.0.0 < 4.0.20 | 4.0.20 |
| broadcom | rabbitmq_server | >= 4.1.0 < 4.1.11 | 4.1.11 |
| broadcom | rabbitmq_server | >= 4.2.0 < 4.2.6 | 4.2.6 |
| rabbitmq | rabbitmq-server | — | — |
| rabbitmq | rabbitmq-server | — | — |
| rabbitmq | rabbitmq-server | — | — |
| rabbitmq | rabbitmq-server | — | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat5.3MEDIUM
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Red Hat
rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
vendor_redhat·2026-09-23·CVSS 5.3
CVE-2026-67405 [MEDIUM] CWE-1385 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler (deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl:104) nor the Web-STOMP handler (deps/rabbitmq_web_stomp/src/rabbit_web_stomp_handler.erl:102) validates the Origin header on the WebSocket upgrade. Under ssl_cert_login=true, the browser presents the client certificate automatically, so an attacker's JavaScript running in the victim's browser can authenticate as the victim. Preconditions include The non-default configuration use_http_auth=true (Web-STOMP) or ssl_cert_login=true (both plugins) must be enabled. The issue is harmless under the default in-band
VulDB
RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5 MQTT rabbit_web_mqtt_handler.erl Origin certificate validation
vuldb·2026-09-23·CVSS 5.3
CVE-2026-67405 [MEDIUM] RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5 MQTT rabbit_web_mqtt_handler.erl Origin certificate validation
A vulnerability identified as problematic has been detected in RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5. The impacted element is an unknown function of the file deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl of the component MQTT Handler. The manipulation of the argument Origin leads to improper certificate validation.
This vulnerability is traded as CVE-2026-67405. It is possible to initiate the attack remotely. There is no exploit available.
You should upgrade the affected component.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation [fedora-all]
bugzilla·2026-09-24·CVSS 5.3
CVE-2026-67405 [MEDIUM] CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation [fedora-all]
CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler (deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl:104) nor the Web-STOMP handler (deps/rabbitmq_web_stomp/src/rabbit_web_stomp_handler.erl:102) validates the Origin header on the WebSocket upgrade. Under ssl_cert_login=true, the browser presents the client certificate automatically, so an attacker's JavaScri
Bugzilla
CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
bugzilla·2026-09-23·CVSS 5.3
CVE-2026-67405 [MEDIUM] CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
CVE-2026-67405 rabbitmq-server: RabbitMQ: Cross-Site WebSocket Hijacking via missing Origin header validation
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, Neither the Web-MQTT handler (deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl:104) nor the Web-STOMP handler (deps/rabbitmq_web_stomp/src/rabbit_web_stomp_handler.erl:102) validates the Origin header on the WebSocket upgrade. Under ssl_cert_login=true, the browser presents the client certificate automatically, so an attacker's JavaScript running in the victim's browser can authenticate as the victim. Preconditions include The non-default configuration use_http_auth=true (Web-STOMP) or ssl_cert_login=true (both plugins) must be enabled. The issue is harmless under the d
2026-09-23
Published