CVE-2026-54123
CVE-2026-54123 is a medium-severity vulnerability in Microsoft Defender For Endpoint with a CVSS 3.x base score of 5.5. 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-200.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (37th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-200
- Affected product: Microsoft Defender For Endpoint
- Published:
- Last modified:
Description
Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.
Frequently asked questions
- What is CVE-2026-54123?
- Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.
- How severe is CVE-2026-54123?
- CVE-2026-54123 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-54123 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-54123?
- CVE-2026-54123 affects Microsoft Defender For Endpoint. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-54123?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-54123 published?
- CVE-2026-54123 was published on 2026-08-11 and last updated on 2026-08-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:defender_for_endpoint:*:*:*:*:*:macos:*:*
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