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PatchSiren cyber security CVE debrief

CVE-2026-65641 Veeam CVE debrief

A vulnerability allowing an unauthenticated network attacker to coerce SMB authentication from the service account was published in the CVE Program record and detailed in the NVD vulnerability database. The vulnerability has a CVSS score of 9.3 and is labeled as CRITICAL. Defenders should assess potential exposure and impact on network services and authentication mechanisms. The CVE Program record and NVD vulnerability database provide official details on this vulnerability, including its severity and potential impact.

Vendor
Veeam
Product
One
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-26
Original CVE updated
2026-09-09
Advisory published
2026-08-26
Advisory updated
2026-09-09

Who should care

Defenders responsible for network services and authentication mechanisms should assess potential exposure and impact. This includes verifying exposure of network services to unauthenticated attackers, assessing potential impact on authentication mechanisms, and reviewing and updating network service configurations to prevent coercion of SMB authentication. Additionally, defenders should prioritize verifying exposure,

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact on network services and authentication mechanisms due to the high severity of this vulnerability.

  • Verification of network service configurations to prevent coercion of SMB authentication
  • Assessment of potential impact on authentication mechanisms
  • Review and update of network service configurations to prevent coercion of SMB authentication

Technical summary

The vulnerability allows an unauthenticated network attacker to coerce SMB authentication from the service account, with a CVSS score of 9.3 and severity labeled as CRITICAL. This vulnerability affects network services and authentication mechanisms, and defenders should prioritize verifying exposure and assessing potential impact. The CVE Program record and NVD vulnerability database provide official details on this vulnerability, including its severity and potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on network services and authentication mechanisms.

Recommended defensive actions

  • Verify exposure of network services to unauthenticated attackers
  • Assess potential impact on authentication mechanisms
  • Review and update network service configurations to prevent coercion of SMB authentication

Evidence notes

The CVE Program record and NVD vulnerability database provide official details on this vulnerability, with a CVSS score of 9.3 and severity labeled as CRITICAL.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-65641 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-65641

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-65641 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-65641

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.