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Description

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

PUBLISHED Reserved 2025-12-30 | Published 2026-02-10 | Updated 2026-02-10 | Assigner microsoft




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CISA Known Exploited Vulnerability

Date added 2026-02-10 | Due date 2026-03-03

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-693: Protection Mechanism Failure

Product status

10.0.28000.0 (custom) before 10.0.28000.1575
affected

10.0.28000.0 (custom) before 10.0.28000.1575
affected

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.20348.0 (custom) before 10.0.20348.4773
affected

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.19044.0 (custom) before 10.0.19044.6937
affected

10.0.19045.0 (custom) before 10.0.19045.6937
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

10.0.26200.0 (custom) before 10.0.26200.7840
affected

10.0.22631.0 (custom) before 10.0.22631.6649
affected

10.0.22631.0 (custom) before 10.0.22631.6649
affected

10.0.25398.0 (custom) before 10.0.25398.2149
affected

10.0.26100.0 (custom) before 10.0.26100.7840
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

6.2.9200.0 (custom) before 6.2.9200.25923
affected

6.3.9600.0 (custom) before 6.3.9600.23022
affected

6.2.9200.0 (custom) before 6.2.9200.25923
affected

6.3.9600.0 (custom) before 6.3.9600.23022
affected

References

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-21513 government-resource

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513 (MSHTML Framework Security Feature Bypass Vulnerability) vendor-advisory patch

cve.org (CVE-2026-21513)

nvd.nist.gov (CVE-2026-21513)

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