PT-2026-4308 · Copilot · Copilot

Published 2026-01-22 · Updated 2026-02-02 · CVE-2026-21521

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Copilot (affected versions not specified)

Description An issue exists in Copilot where improper neutralization of escape, meta, or control sequences can allow an unauthorized attacker to disclose information over a network. The issue involves the potential for information disclosure.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-150

Related Identifiers

CVE-2026-21521

Affected Products

Copilot

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-21521 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521 · Vendor Advisory
• https://t.me/cveNotify/150558 · Telegram Post
• https://t.me/cveNotify/149626 · Telegram Post
• https://twitter.com/CVEnew/status/2014576994596573311 · Twitter Post
• https://t.me/msrcreports/3002 · Telegram Post