Is CVE-2026-12957 actively exploited?

No active exploitation of CVE-2026-12957 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-12957 be exploited remotely?

No. CVE-2026-12957 requires local access to exploit.

What is the CVSS score of CVE-2026-12957?

CVE-2026-12957 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-12957

HIGH

CVE-2026-12957

CWE-732Published: June 23, 2026· Updated: Jun 23, 2026

7.8

CVSS v3.1

EPSS:0.12%probability of exploitation in 30 daysPercentile:2.0th

Official Description

Improper trust boundary enforcement in Language Servers for AWS before version 1.65.0 on all supported platforms may allow a for arbitrary code execution. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically executed. This issue requires the user to trust the workspace when prompted.

To remediate this issue, users should upgrade to Language Servers for AWS version 1.65.0 or higher.

NVD Source

Technical Analysis

CVE-2026-12957 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.None

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

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News & Research Mentioning CVE-2026-12957

Amazon Q Developer Flaw Could Let Malicious Repos Run Code via MCP Configs

The Hacker News· Jun 26, 2026

A high-severity flaw in Amazon Q Developer let a malicious repository run commands and steal a developer's cloud credentials. The path was short: a developer opens the repo, trusts the workspace, and Amazon Q does the rest. Amazon has patched it. Tracked as CVE-2026-12957 (CVSS 8.5), the bug sat in how Amazon's AI coding assistant handled Model Context Protocol (MCP) servers. Wiz [xlite_meta score:50 src:The Hacker News xlite_fp:deb6cb1ebf98ae5e97f7bc2db4306aecc8d5d35229ffcfb2d820a7336c4959da]