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MEDIUM severity

CVE-2026-47837

MEDIUM

CVE-2026-47837 is a medium-severity (CVSS 6.8) Missing Authentication vulnerability in vmware spring cloud config. O3 Security detects and blocks CVE-2026-47837 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

Missing Authentication for Critical Function vulnerability in Spring Spring Cloud Config allows Webhook requests to Spring Cloud Config Server's /monitor endpoint are not validated. This…

Published
Aug 26, 2026
Updated
Sep 4, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Sep 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-47837.

Description

Missing Authentication for Critical Function vulnerability in Spring Spring Cloud Config allows Webhook requests to Spring Cloud Config Server's /monitor endpoint are not validated.

This issue affects Spring Cloud Config: 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.

Affected Products

1 product · 4 configurations
Application
spring cloud configvmware
≥ 5.0.0 && < 5.0.5
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every vmware spring cloud config deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the vmware spring cloud config security patch or hotfix for CVE-2026-47837 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-47837 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-47837. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Missing Authentication for Critical Function vulnerability in Spring Spring Cloud Config allows Webhook requests to Spring Cloud Config Server's /monitor endpoint are not validated. This issue affects Spring Cloud Config: 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.
O3 Security · Runtime Protection

Is CVE-2026-47837 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-47837 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-47837: Spring Cloud Config… | O3 Security