PT-2026-20942 · Microsoft · Teams

Stefan Weywith · Published 2026-02-19 · Updated 2026-05-13 · CVE-2026-21535

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

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

Description An improper access control issue exists in Microsoft Teams. This allows an unauthorized attacker to disclose sensitive information over a network. The issue is due to insufficient validation or enforcement of access permissions within the application, enabling malicious actors to access data they should not have rights to.

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

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-21535

Affected Products

Teams

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-21535 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21535 · Vendor Advisory
• https://twitter.com/RoryCrave/status/2024909986044751886 · Twitter Post
• https://twitter.com/vitobotta/status/2054517033119707291 · Twitter Post
• https://twitter.com/CveTodo/status/2024627128285671676 · Twitter Post
• https://t.me/msrcreports/3132 · Telegram Post
• https://t.me/CVEtracker/45197 · Telegram Post