CVE-2026-48579
Microsoft Exchange Online Information Disclosure Vulnerability
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Exchange Online Information Disclosure Vulnerability
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-48579- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Weakness
- CWE-285
- Updated
- 2026-11-02
EUVDEUVD-2026-34338
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
- Record
EUVD-2026-34338- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jwv5-9w8q-m2j8
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose...
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
- Record
GHSA-jwv5-9w8q-m2j8- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-285
- Updated
- 2026-11-02
NVD
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-48579- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-285
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-48579 is a critical vulnerability (CVSS 9.1) in Microsoft Exchange Online, published June 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.01%, the 63rd percentile. No source names a fixed version.