EUVD-2026-56447
GHSA-476g-mrq6-qc6c
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSRF-driven privilege escalation grants elevated read and write access to Exchange data (C:H, I:H), but no mechanism for availability denial is described, so A:N.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
SSRF in Microsoft Exchange Server enables authenticated, low-privilege network attackers to escalate privileges, with Microsoft reporting high confidentiality, integrity, and availability impact across Exchange 2016, 2019, and Subscription Edition. Vendor-released patches are available covering all affected cumulative update branches. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid Exchange account with at least low-privilege access - confirmed by PR:L in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The raw CVSS 8.8 (High) vector - AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - implies a straightforward, low-friction, high-impact attack, but several cross-source signals argue for a more measured posture. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's released patches immediately for internet-facing Exchange deployments. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Exchange Server instances running versions 2016, 2019, or Subscription Edition and assess patch compatibility for your environment. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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