CVE-2026-47837 Spring CVE debrief

Who should care

Organizations using Spring Cloud Config, particularly those with exposed /monitor endpoints, should be aware of this vulnerability and take steps to mitigate it. This includes assessing their current configurations, verifying potential exposure, and applying patches or updates as necessary. Security teams and vulnerability management teams should prioritize this vulnerability based on their organization's use of Spring Cloud Config and potential impact of an exploit.

Technical summary

CVE-2026-47837 is a Missing Authentication for Critical Function vulnerability in Spring Cloud Config. The vulnerability allows Webhook requests to the /monitor endpoint to be processed without proper validation, potentially leading to unauthorized access. Affected versions include 5.0.0 through 5.0.4, 4.3.0 through 4.3.4, 4.0.0 through 4.2.8, and 3.1.14. Organizations using Spring Cloud Config should assess their exposure and apply patches or updates to address the vulnerability.

Defensive priority

Organizations using Spring Cloud Config should prioritize patching to prevent potential unauthorized access.

Recommended defensive actions

• Apply patches or updates to Spring Cloud Config to address the vulnerability
• Restrict access to the /monitor endpoint
• Monitor for suspicious activity related to Webhook requests
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE-2026-47837 record indicates a Missing Authentication for Critical Function vulnerability in Spring Cloud Config. Webhook requests to the /monitor endpoint are not validated. This issue affects Spring Cloud Config versions from 5.0.0 through 5.0.4, from 4.3.0 through 4.3.4, from 4.0.0 through 4.2.8, and through 3.1.14. Organizations should verify their deployments and configurations to understand potential exposure and take appropriate mitigation steps.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.