Microsoft Security Update Guide · Defender
Microsoft Defender for Endpoint for Mac Information Disclosure Vulnerability
Published
What does this mean?
- Information Disclosure. An attacker can see information that is not meant for them.
- It can be exploited with access to the device itself, with an ordinary user account and without any user action.
- CVSS 5.5 out of 10: medium. Microsoft rates it Important.
- No attacks reported; Microsoft expects exploitation to be less likely.
- What should you do? Install the security update for the version you run (or a later cumulative update):
- Microsoft Defender for Endpoint for Mac: KBRelease Notes
101.26042.0020
- Microsoft Defender for Endpoint for Mac: KBRelease Notes
Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.
What kind of flaw is this?
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Sensitive information reaches someone who should not have it.
Key facts
Released
11 aug 2026
Impact
Information Disclosure
Max severity
Important
Weakness
CVSS 3.1
5.5 / 4.8 (base / temporal)
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:CPublicly disclosed
No
Exploited
No
Exploitability assessment
Exploitation Less Likely
Customer action required
Yes
Links
CVSS metrics
| Base score metrics | |
|---|---|
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity | None |
| Availability | None |
| Temporal score metrics | |
| Exploit Code Maturity | Unproven |
| Remediation Level | Official Fix |
| Report Confidence | Confirmed |
Affected products and updates
| Product | Update | Build |
|---|---|---|
| Microsoft Defender for Endpoint for Mac | KBRelease Notes | 101.26042.0020 |
FAQ
- What information could be disclosed by successfully exploiting this vulnerability?
- An attacker who successfully exploited this vulnerability could view Microsoft Defender for Endpoint configuration exclusion settings that are intended to be viewable only by administrators.
Revisions
| Version | Date | Note |
|---|---|---|
| 1 | 11 aug 2026 | Information published. |
What changed in Microsoft 365 this week? →
View at Microsoft → ← All security advisories
Source: Microsoft Security Update Guide. 365Fanatic is not affiliated with Microsoft.
