Quick answers
- Is CVE-2026-18953 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18953 being exploited in the wild.
- How severe is CVE-2026-18953?
- High severity, published 9 September 2026.
- Which products and versions are affected?
- AWS Transform MCP Server.
- Is there a fix for CVE-2026-18953?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-18953 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-18953?
- Check whether you run Amazon AWS or Amazon Web Services Transform MCP Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The AWS Transform MCP Server fails to properly validate or sanitize pathname input, allowing an attacker to traverse directory structures and access files outside the intended application directory. This is a classic path traversal vulnerability (CWE-22) where insufficient validation of user-supplied file paths permits access to arbitrary files on the system. The vulnerability likely requires some form of access to the MCP Server interface (local, network, or through MCP protocol), but the exact attack preconditions are not detailed in the advisory. An attacker exploiting this flaw could read sensitive configuration files, credentials, or other data stored alongside the application. AWS has released a security bulletin indicating awareness of the issue, though specific patch details and affected version ranges are not provided in the available advisory text.
Affected products
- AWS Transform MCP Server
Timeline
- 2026-09-09: disclosed