CVE-2026-56165
CVE-2026-56165 is a critical-severity vulnerability in Microsoft Account with a CVSS 3.x base score of 9.8. 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-122.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- EPSS exploit prediction: 1% (51st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-122
- Affected product: Microsoft Account
- Published:
- Last modified:
Description
Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
Frequently asked questions
- What is CVE-2026-56165?
- Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.
- How severe is CVE-2026-56165?
- CVE-2026-56165 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-56165 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-56165?
- CVE-2026-56165 affects Microsoft Account. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-56165?
- 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.
- When was CVE-2026-56165 published?
- CVE-2026-56165 was published on 2026-07-24 and last updated on 2026-07-30.
References
Affected products (1)
- cpe:2.3:a:microsoft:account:-:*:*:*:*:*:*:*
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