CVE-2026-69438

CVE-2026-69438 is a high-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 8.1. 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-681.

Key facts

• Severity: High (CVSS 3.x base score 8.1)
• EPSS exploit prediction: 1% (52nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-681
• Affected product: Microsoft Windows 10 1607
• Published: 2026-09-08
• Last modified: 2026-09-29

Description

Incorrect conversion between numeric types in Microsoft JScript allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-69438?

Incorrect conversion between numeric types in Microsoft JScript allows an unauthorized attacker to execute code over a network.

How severe is CVE-2026-69438?

CVE-2026-69438 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-69438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-69438?

CVE-2026-69438 primarily affects Microsoft Windows 10 1607. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-69438?

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.

When was CVE-2026-69438 published?

CVE-2026-69438 was published on 2026-09-08 and last updated on 2026-09-29.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69438

Affected products (24)

• cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

More vulnerabilities in Microsoft Windows 10 1607

• CVE-2026-57092 — Critical (CVSS 9.9): Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a network.
• CVE-2026-77493 — Critical (CVSS 9.8): Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
• CVE-2026-73025 — Critical (CVSS 9.8): Weak authentication in Windows iSCSI allows an unauthorized attacker to bypass a security feature over a network.
• CVE-2026-73009 — Critical (CVSS 9.8): Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over…
• CVE-2026-72983 — Critical (CVSS 9.8): Use after free in Windows Internet Connection Sharing (ICS) allows an unauthorized attacker to execute code over a…
• CVE-2026-72982 — Critical (CVSS 9.8): Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

All CVEs affecting Microsoft Windows 10 1607 →

Other CWE-681 vulnerabilities

• CVE-2022-40138 — Critical (CVSS 9.8): An integer conversion error in Hermes bytecode generation, prior to commit 6aa825e480d48127b480b08d13adf70033237097,…
• CVE-2021-36357 — Critical (CVSS 9.8): An issue was discovered in OpenPOWER 2.6 firmware. unpack_timestamp() calls le32_to_cpu() for endian conversion of a…
• CVE-2021-38187 — Critical (CVSS 9.8): An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a…
• CVE-2019-19317 — Critical (CVSS 9.8): lookupName in resolve.c in SQLite 3.30.1 omits bits from the colUsed bitmask in the case of a generated column, which…
• CVE-2019-14842 — Critical (CVSS 9.8): Structured reply is a feature of the newstyle NBD protocol allowing the server to send a reply in chunks. A bounds…
• CVE-2018-8786 — Critical (CVSS 9.8): FreeRDP prior to version 2.0.0-rc4 contains an Integer Truncation that leads to a Heap-Based Buffer Overflow in…

Browse all CWE-681 vulnerabilities →