CVE-2026-33823
CVE-2026-33823 is a critical-severity vulnerability in Microsoft Teams with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.
Key facts
- Severity: Critical (CVSS 3.x base score 9.6)
- EPSS exploit prediction: 1% (49th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-28450
- Weakness: CWE-285
- Affected product: Microsoft Teams
- Published:
- Last modified:
Description
Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.
Frequently asked questions
- What is CVE-2026-33823?
- Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.
- How severe is CVE-2026-33823?
- CVE-2026-33823 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-33823 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33823?
- CVE-2026-33823 affects Microsoft Teams. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-33823?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-33823 have an EU (EUVD) identifier?
- Yes. CVE-2026-33823 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28450.
- When was CVE-2026-33823 published?
- CVE-2026-33823 was published on 2026-05-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:teams:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Teams
- CVE-2023-4863 — High (CVSS 8.8): Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to…
- CVE-2023-29330 — High (CVSS 8.8): Microsoft Teams Remote Code Execution Vulnerability
- CVE-2023-29328 — High (CVSS 8.8): Microsoft Teams Remote Code Execution Vulnerability
- CVE-2026-21535 — High (CVSS 8.2): Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- CVE-2026-42835 — High (CVSS 8.1): Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Teams…
- CVE-2020-17091 — High (CVSS 7.8): Microsoft Teams Remote Code Execution Vulnerability
All CVEs affecting Microsoft Teams →
Other CWE-285 (Improper Authorization) vulnerabilities
- CVE-2025-65041 — Critical (CVSS 10.0): Improper authorization in Microsoft Partner Center allows an unauthorized attacker to elevate privileges over a network.
- CVE-2023-33189 — Critical (CVSS 10.0): Pomerium is an identity and context-aware access proxy. With specially crafted requests, incorrect authorization…
- CVE-2022-2595 — Critical (CVSS 10.0): Improper Authorization in GitHub repository kromitgmbh/titra prior to 0.79.1.
- CVE-2021-28799 — Critical (CVSS 10.0): An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If…
- CVE-2026-34048 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
- CVE-2026-5412 — Critical (CVSS 9.9): In Juju versions prior to 2.9.57 and 3.6.21, an authorization issue exists in the Controller facade. An authenticated…
Browse all CWE-285 (Improper Authorization) vulnerabilities →