CVE-2026-26143
CVE-2026-26143 is a high-severity vulnerability in Microsoft Powershell with a CVSS 3.x base score of 7.8. 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-20.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 1% (43rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-22369
- Weakness: CWE-20
- Affected product: Microsoft Powershell
- Published:
- Last modified:
Description
Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.
Frequently asked questions
- What is CVE-2026-26143?
- Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.
- How severe is CVE-2026-26143?
- CVE-2026-26143 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-26143 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-26143?
- CVE-2026-26143 affects Microsoft Powershell. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-26143?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-26143 have an EU (EUVD) identifier?
- Yes. CVE-2026-26143 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22369.
- When was CVE-2026-26143 published?
- CVE-2026-26143 was published on 2026-04-14 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*
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