CVE-2026-21535
published 2026-02-19CVE-2026-21535: Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
PriorityP350high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.59%
44.3th percentile
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_teams | — | — |
| msrc | microsoft_teams | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_msrc8.2HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-rx38-cw65-cmwp: Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network
ghsa_unreviewed·2026-02-20
CVE-2026-21535 [HIGH] CWE-284 GHSA-rx38-cw65-cmwp: Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Microsoft
Microsoft Teams Information Disclosure Vulnerability
vendor_msrc·2026-02-10·CVSS 8.2
CVE-2026-21535 [HIGH] CWE-284 Microsoft Teams Information Disclosure Vulnerability
Microsoft Teams Information Disclosure Vulnerability
Description: Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
FAQ: Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.
Microsoft Teams: Microsoft Teams
Microsoft: Microsoft
Customer Action Required: No
Impact: Information Disclosure
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-02-19
Published