Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.36% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-65777High confidence
Active Directory Security Feature Bypass Vulnerability
Microsoft · Windows 11 version 23H2
5.3MediumCVSS 3.1
Scheduled
Patch availableMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Medium, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Microsoft Windows 11 version 23H2 and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available01
What, why and how
Inadequate encryption strength in Windows Active Directory allows an authorized attacker to bypass a security feature over a network.
What
Inadequate encryption strength in Windows Active Directory allows an authorized attacker to bypass a security feature over a network.
Why
The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
Inadequate encryption strength in Windows Active Directory allows an authorized attacker to bypass a security feature over a network.
Why
The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Inadequate Encryption Strength → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-326 ↗
CWE-326: Inadequate Encryption Strength. The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:CCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33296
- Windows Server 2025: 10.0.26100.0 < 10.0.26100.33296
- Windows Server 2022: 10.0.20348.0 < 10.0.20348.5499
- Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9168
- Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7517
- Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2704
- Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9168
- Action
- Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 11 Aug 2026 · Last source change 29 Sept 2026, 20:22 UTC · CWE-326 · Inadequate Encryption Strength
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-56731
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 10.0.22631.0 < 10.0.22631.7517; 10.0.26100.0 < 10.0.26100.9168; 10.0.26200.0 < 10.0.26200.9168; 10.0.28000.0 < 10.0.28000.2704; 10.0.20348.0 < 10.0.20348.5499; 10.0.26100.0 < 10.0.26100.33296 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
- After
- Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7517; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7517; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9168; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9168; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2704; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5499; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33296; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33296 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
- Vendor guidanceAuthoritative vendor guidance changed: added patch: msrc.microsoft.com/CVE-2026-65777; added remediation: msrc.microsoft.com/CVE-2026-65777.secure@microsoft.com ↗
- Before
- no authoritative guidance recorded
- After
- patch: msrc.microsoft.com/CVE-2026-65777 · remediation: msrc.microsoft.com/CVE-2026-65777
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 10.0.22631.0 < 10.0.22631.7517; 10.0.26100.0 < 10.0.26100.9168; 10.0.26200.0 < 10.0.26200.9168; 10.0.28000.0 < 10.0.28000.2704; 10.0.20348.0 < 10.0.20348.5499; 10.0.26100.0 < 10.0.26100.33296 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- 10.0.22631.0 < 10.0.22631.7517; 10.0.26100.0 < 10.0.26100.9168; 10.0.26200.0 < 10.0.26200.9168; 10.0.28000.0 < 10.0.28000.2704; 10.0.20348.0 < 10.0.20348.5499; 10.0.26100.0 < 10.0.26100.33296 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
- Remediation statusRemediation status changed from Awaiting fix to Patch available.secure@microsoft.com ↗
- Before
- Awaiting fix
- After
- Patch available
CVE published
Fixed release or patch reference recorded
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.