8.2

CVE-2026-21535: microsoft microsoft teams Improper Access Control

CVSS: 8.2v3.1HighAnalyzed
Published 19-02-2026Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2026-21535 is a high (CVSS 8.2) Improper Access Control vulnerability in microsoft microsoft teams. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.4% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.65%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-02-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.65%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

+0.05 pp

From 0.60% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.65%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft2 products

1 vendor · 2 products

References

1 links