CVE-2026-69729

HIGH 8.8 ALL-YEARS

Published 2026-09-08 · Last modified 2026-10-14 · microsoft · NVD: Analyzed

Heap-based buffer overflow in Windows Credential Providers allows an authorized attacker to execute code over a network.

ELEVATED IMPACT

Severe if exploited (CVSS 8.8), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.9%chance of exploitation in 30 days · 60th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

8.8CVSS 3.1 · HIGH · CNA

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
⚠Privileges: Requires a low-privilege account
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Microsoft

Products Windows 11 Version 24h2 Windows 11 Version 25h2 Windows 11 Version 26h1 Windows Server 2025 Windows Server 2025 (Server Core Installation) Windows 11 24h2 Windows 11 25h2 Windows 11 26h1

Weakness (CWE)

CWE-122: : Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References and research data (JSON)

Known Affected Software Configurations

Vendor	Product	Version range
Microsoft	Windows 11 24h2	< 10.0.26100.9445
Microsoft	Windows 11 24h2	< 10.0.26100.9445
Microsoft	Windows 11 25h2	< 10.0.26200.9445
Microsoft	Windows 11 25h2	< 10.0.26200.9445
Microsoft	Windows 11 26h1	< 10.0.28000.2954
Microsoft	Windows 11 26h1	< 10.0.28000.2954
Microsoft	Windows Server 2025	< 10.0.26100.33438

All CVSS metrics

HIGH 8.8 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69729 vendor-advisorypatchVendor AdvisoryPatchCVE record · microsoft · Updated 2026-10-14T23:07:06.288Z
NVD · CVE-2026-69729 · Updated 2026-09-22T20:05:59.300

Advisories

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-73040 ADVISORYEUVD · EUVD-2026-73040

Sources: NVD · CVE.org · All sources and attribution · EPSS