CVE-2026-59272 in Spring AMQP
Summary
by MITRE • 08/27/2026
Any application shipping logs to RabbitMQ over TLS via the Log4j2 appender, relying on the documented default, is exposed to man-in-the-middle interception of every log event. Spring AMQP 4.1.0 Spring AMQP 4.0.0 - 4.0.4 Spring AMQP 3.2.0 - 3.2.12 Spring AMQP 2.4.18 and earlier
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified in the specified versions of Spring AMQP, specifically affecting log shipping via RabbitMQ over TLS using Log4j2 appenders, represents a critical failure in transport layer security configuration defaults. This flaw stems from an insecure default setting within the library that fails to enforce strict certificate validation when establishing secure connections. When applications utilize these vulnerable versions to transmit sensitive logging data to a RabbitMQ message broker, they inadvertently rely on a baseline configuration that permits man-in-the-middle attacks. The core technical issue lies in how the TLS handshake is negotiated; rather than requiring the client to verify the server's identity against a trusted certificate authority or a specific set of known public keys, the application accepts any valid-looking certificate presented by the remote endpoint. This oversight effectively nullifies the confidentiality and integrity guarantees that Transport Layer Security (TLS) is designed to provide, turning what should be an encrypted channel into one susceptible to interception and modification.
From a technical perspective, this vulnerability aligns with CWE-295 Improper Certificate Validation, as the application does not adequately verify the authenticity of the server's certificate during the TLS handshake process. By accepting any certificate without strict validation checks such as hostname verification or chain-of-trust confirmation, the software allows an attacker positioned between the client and the RabbitMQ broker to intercept the connection. The attacker can present a self-signed or forged certificate that matches the expected host name but is not signed by a trusted authority recognized by the application's trust store. Since Log4j2 appenders are often configured with default settings for ease of deployment, many organizations may have inadvertently deployed systems where every log event containing sensitive information such as user credentials, session tokens, internal architecture details, or personal data is transmitted in plaintext to an attacker-controlled endpoint rather than being securely encrypted and authenticated by the intended RabbitMQ server.
The operational impact of this vulnerability is severe due to the nature of logging frameworks which often capture high-value security events. Log4j2 is widely used across enterprise Java applications for recording application behavior, errors, and security incidents. If an attacker successfully performs a man-in-the-middle attack on these connections, they gain access to a continuous stream of log data. This can lead to the exposure of authentication tokens, database connection strings, internal IP addresses, and potentially sensitive business logic details encoded in error messages or debug logs. Furthermore, because TLS is compromised, the integrity of the logging pipeline is also at risk; an attacker could not only read but also inject false log entries into the RabbitMQ queue, leading to security blind spots where malicious activities go undetected due to tampered audit trails. This undermines forensic capabilities and incident response efforts that rely on accurate historical data from these logs.
This scenario maps directly to MITRE ATT&CK technique T1078 Valid Accounts if the attacker uses stolen credentials obtained via interception, or more accurately to T1557 Adversary-in-the-Middle for the initial compromise of communications and potentially T1048 Exfiltration Over Alternative Protocol since RabbitMQ is being used as a covert channel for data exfiltration. The use of AMQP over TLS should inherently provide strong mutual authentication, but this default configuration bypasses those safeguards. Organizations relying on these specific versions must recognize that the convenience of default configurations has introduced significant risk into their security posture by weakening one of the primary defenses against network-level eavesdropping and spoofing attacks.
To mitigate this vulnerability, immediate action is required to upgrade Spring AMQP to a version where secure defaults are enforced or explicitly configured with strict TLS settings. For applications that cannot immediately upgrade, administrators must manually configure the Log4j2 RabbitMQ appender to enforce certificate validation by specifying a trust store containing only trusted certificates and disabling any options that allow insecure connections such as accepting all certificates. It is critical to ensure that hostname verification is enabled so that the client validates that the server's certificate matches the expected domain name of the RabbitMQ broker. Additionally, organizations should conduct an inventory scan to identify all systems using vulnerable versions of Spring AMQP or Log4j2 configurations pointing to RabbitMQ and apply these configuration hardening measures immediately. Regular security audits of logging infrastructure are recommended to ensure that default settings do not inadvertently weaken cryptographic protections in production environments.