CVE-2026-26030

critical

Description

Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the `InMemoryVectorStore` filter functionality. The problem has been fixed in version `python-1.39.4`. Users should upgrade this version or higher. As a workaround, avoid using `InMemoryVectorStore` for production scenarios.

References

https://thehackernews.com/2026/06/autojack-attack-lets-one-web-page.html

https://thehackernews.com/2026/05/chatgphish-vulnerability-turns-chatgpt.html

https://www.tenable.com/blog/microsofts-march-2026-patch-tuesday-addresses-83-cves-cve-2026-21262-cve-2026-26127

https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx

https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4

https://github.com/microsoft/semantic-kernel/pull/13505

Details

Source: Mitre, NVD

Published: 2026-02-19

Updated: 2026-03-03

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9.9

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

Severity: Critical

EPSS

EPSS: 0.00089