AWS Warns Outbound Traffic Blind Spots Can Enable Cloud Data Exfiltration Cloud Security

The AWS report shared with Cyber Security News (CSN) points to cases where unpatched vulnerabilities, such as CVE-2025-55182 (React2Shell), allowed attackers to gain code execution and immediately start exfiltrating data. The issue is tracked as CVE-2025-55182. From there, the focus shifts to foundational controls: deploying organization-wide policies that restrict what identities can access, setting up a centralized network firewall to inspect all internet-bound traffic, and applying endpoint policies that limit which external resources workloads can reach.

The Cloud Risk

Security researchers at AWS identified this growing blind spot and published a detailed advisory on June 22, 2026, noting the risk applies to both traditional cloud workloads and the newer wave of AI-driven systems.

Further details indicate that architecture overview (Source, AWS) Another concern is what happens when stolen credentials are used to copy data to external storage.

An agent running inside a cloud environment follows the same network paths as any other workload, facing the same domain filters, DNS rules, and data access restrictions when those controls are correctly in place.

According to the OWASP Top 10 for Agentic Applications, threats like Agent Goal Hijack and Unexpected Code Execution mean AI agents can be manipulated into silently sending data outside the organization.

Configuration & Exposure

CVEs:

• CVE-2025-55182

Technical specifics on the underlying mechanism remain under review by security researchers.

Affected Environments

Most organizations spend a lot of time locking the front door of their cloud environments. These agents often have access to tools, APIs, and code interpreters, making them high-value targets. Layered Egress Controls and How to Apply Them AWS outlines a phased strategy that organizations can follow to build their defenses without disrupting existing operations.

These controls work together to prevent both traditional workloads and AI agents from sending data where they should not.

Timeline

| Date | Event | |, , |, , -| | June 22, 2026 | Security researchers at AWS identified this growing blind spot and published a detailed advisory on June 22, 2026, no… | | 2025 | The AWS report shared with Cyber Security News (CSN) points to cases where unpatched vulnerabilities, such as CVE-202… |

Remediation Steps

1. The AWS report shared with Cyber Security News (CSN) points to cases where unpatched vulnerabilities, such as CVE-2025-55182 (React2Shell), allowed attackers to gain code execution and immediately start exfiltrating data.

2. Without endpoint-level policies restricting which storage buckets a workload can access, a compromised identity can move sensitive files to an attacker-controlled account in seconds.

3. When a suspicious finding surfaces, automated workflows can update firewall block lists in real time, revoke credentials, and alert security teams before significant damage occurs.

4. AWS recommends centralizing all findings so teams can correlate signals across services and respond faster.

5. An agent running inside a cloud environment follows the same network paths as any other workload, facing the same domain filters, DNS rules, and data access restrictions when those controls are correctly in place.

6. The post AWS Warns Outbound Traffic Blind Spots Can Enable Cloud Data Exfiltration appeared first on Cyber Security News.

Analysis

This disclosure adds to a growing pattern of significant vulnerabilities affecting enterprise infrastructure. Misconfigurations and patching gaps in cloud environments remain a persistent vector for unauthorized access.

Sources

1. https://nvd.nist.gov/vuln/detail/CVE-2025-55182
2. https://www.cve.org/CVERecord?id=CVE-2025-55182