Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
1 version affected across 1 product
| Date | Total | Labels |
|---|
| 2026-02-19 | 1 | Disclosure1 |
| 2026-02-20 | 3 | Disclosure2Patch1 |
| 2026-02-21 | 2 | Disclosure2 |
| 2026-05-13 | 1 | Patch1 |
#securityupdate #microsoft #定例外 2026. 2.20 Microsoft Teams の情報漏えいの脆弱性 CVE-2026-21535 Security Vulnerability リリース日: Feb 20, 2026 - マイクロソフト https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21535
Post summary
Microsoft announced CVE-2026-21535 as a security vulnerability affecting Microsoft Teams, noting an information‑leak issue but providing no further technical details or mitigation information.
Microsoft just patched a high-severity flaw in Teams (CVE-2026-21535, CVSS 8.2) that allowed unauthenticated attackers to access sensitive network data remotely. No credentials needed. No user interaction needed. No elevated privileges needed. Just network access. The good news: it was a server-side fix, so no action required from Teams users or admins. Already patched. This comes on top of an already brutal February Patch Tuesday with 6 actively exploited zero-days across Windows Shell, MSHTML, Word, RDP, and more. https://www.techzine.eu/news/security/138956/microsoft-closes-teams-leak-that-allowed-access-without-authentication/ #InfoSec #CyberSecurity #Microsoft #Teams #PatchTuesday
Post summary
Microsoft has released a patch for CVE-2026-21535, a high‑severity Teams flaw allowing unauthenticated remote access; users and admins need not take action as the fix is server‑side.
Unauthenticated info disclosure in Microsoft Teams. CVE-2026-21535. No login needed, just network access, and you can pull sensitive data from a tool that sits open on every corporate laptop. Part of Patch Tuesday this month, 120+ CVEs total, no zero-days. Patch your Teams installs. https://www.bleepingcomputer.com/news/microsoft/microsoft-may-2026-patch-tuesday-fixes-120-flaws-no-zero-days/
Post summary
Microsoft Teams CVE-2026-21535 is an unauthenticated info disclosure disclosed in Patch Tuesday; no active exploitation reported, but teams should apply the available patch.
#securityupdate #microsoft #定例外 CVE-2026-21535 Security Vulnerability 影響: 情報漏えい 最大深刻度: 緊急 CVSS:3.1 8.2 / 7.1 悪用可能性 ・一般に公開: No ・悪用: No ・Exploitability assessment: 悪用される可能性は非常に低い https://x.com/kawn2020/status/2025028103609909582
Post summary
The tweet discloses CVE-2026-21535 as an information‑leak vulnerability with high CVSS scores, but provides no PoC, exploit, or patch details.
CVE-2026-21535 Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network. https://www.cve.org/CVERecord?id=CVE-2026-21535
Post summary
The statement provides a brief disclosure of an improper access control vulnerability in Microsoft Teams that could enable information disclosure over the network.
CVE-2026-21535 | Microsoft Teams Information Disclosure Vulnerability https://www.aakashrahsi.online/post/cve-2026-21535 https://t.co/I09LqwQjWi
Post summary
A new CVE (CVE‑2026‑21535) has been identified for an information disclosure vulnerability in Microsoft Teams, but no PoC, exploit, active exploitation, patch, or debunking information is provided.
**CVE-2026-21535** pertains to an **improper access control** vulnerability within **Microsoft Teams**, a widely used collaboration platform. This flaw allows an **unauthorized attacker** to **disclose sensitive information** over the network without requiring user privileges or interaction. The core issue stems from insufficient validation or enforcement of access permissions within the application, enabling malicious actors to access data they should not have rights to. #Cybersecurity #CVE #HighSeverity #SecurityAlert #RemoteCodeExecution #Microsoft https://cvetodo.com/cve/CVE-2026-21535
Post summary
The post announces CVE-2026-21535, an improper access control vulnerability in Microsoft Teams that could allow sensitive data disclosure without privileged access; no PoC, exploit, active exploitation, or patch is mentioned.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | microsoft | teams | - | - | - |