Spring Cloud Stream CVE-2026-59302

Exploitation requires the application to be running one of the affected Spring Cloud Stream versions (4.2.0-4.2.6, 4.3.0-4.3.3, or 5.0.0-5.0.2) with a logging configuration that captures output at a verbosity level sufficient to record sensitive message content (typically DEBUG or verbose INFO). The CVSS vector (PR:H, AC:H, UI:R) indicates that a high-privilege account is required to trigger the logging behavior, and user interaction is necessary - ruling out fully automated exploitation. The attacker or malicious insider must also have read access to the log storage system to retrieve the exposed data. Non-default verbose logging configurations significantly increase risk; default production logging levels (WARN/ERROR) limit or eliminate sensitive data exposure. There is no remote unauthenticated exploitation path indicated by the available data.

The official CVSS 3.1 base score of 3.1 (Low) accurately reflects the constrained real-world risk: the vector (AV:N/AC:H/PR:H/UI:R) requires high privileges, high attack complexity, and user interaction - a combination that severely limits exploitability. EPSS data is not present in the available intelligence, and the absence of both a KEV listing and any public exploit code further supports treating this as a low-priority issue in most environments. The confidentiality impact is rated Low (C:L) and integrity Low (I:L), with no availability impact, meaning even successful exploitation yields only marginal gain for an attacker. The practical threat is largely an insider or post-compromise scenario: an attacker who already has access to log infrastructure could harvest credentials or tokens surfaced in logs. The CVSS vector's PR:H suggests that triggering or observing the vulnerable logging behavior requires elevated privileges, which substantially narrows the attacker population. This is not a vulnerability that demands emergency patching outside of sensitive environments - teams handling regulated data (PII, financial, healthcare) should prioritize remediation, but a standard enterprise deployment can treat this as a scheduled maintenance upgrade rather than an urgent response.

An operator with elevated access to a Spring Cloud Stream application - such as an administrator or a compromised privileged account - triggers a messaging operation that causes the framework to log message payload or header content containing sensitive data such as API keys, tokens, or PII. A separate actor with read access to the centralized log store (e.g., a shared logging platform) retrieves the sensitive data from the log entries without needing direct access to the originating application. No public exploit code exists at the time of analysis.