XML External Entity Injection Vulnerability in LocalS3 by Robothy
CVE-2025-27136
Key Information:
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What is CVE-2025-27136?
LocalS3, an Amazon S3 mock service designed for testing and local development, has a vulnerability in its bucket creation endpoint that allows XML External Entity (XXE) injection. Before version 1.21, the service's XML parser resolves external entities without adequate validation. This misconfiguration enables an attacker to craft an XML document that, when processed, makes HTTP requests to internal services. By exploiting this weakness, attackers can perform server-side request forgery (SSRF) attacks, potentially leaking sensitive information from internal resources that should remain inaccessible to external networks.
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Affected Version(s)
local-s3 < 1.21
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.
References
CVSS V4
Timeline
- 🟡
Public PoC available
- 👾
Exploit known to exist
Vulnerability published
Vulnerability Reserved