EUVD-2026-63689
GHSA-w5cc-jcwc-q4f8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSRF is remotely reachable with no auth or user interaction (AV:N/AC:L/PR:N/UI:N); server-side forged requests cross a trust boundary (S:C) enabling privilege elevation with high C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Server-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Elevation of privilege in Microsoft Exchange Online lets an unauthorized network attacker abuse a server-side request forgery (CWE-918) flaw to make the service issue attacker-controlled internal requests, crossing a privilege/trust boundary (CVSS scope change) to reach backend resources. The CVSS 10.0 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) reflects unauthenticated, low-complexity network exploitation with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per the CVSS vector (AV:N/AC:L/PR:N/UI:N), no special conditions - remote unauthenticated exploitation over the network against Microsoft Exchange Online with low complexity and no user interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are largely consistent and point to genuine high priority: CVSS 3.1 base is the maximum 10.0 with AV:N/AC:L/PR:N/UI:N, meaning remote, unauthenticated, low-complexity exploitation, plus S:C and C:H/I:H/A:H. … 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 | Because Microsoft Exchange Online is a cloud-hosted service, the fix is deployed by Microsoft on the server side (patch available per vendor advisory) and no customer-side upgrade action is required for the service itself; no exact fix version is published because the service is not customer-versioned. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm your Exchange Online environment is running the latest patched version and review Microsoft's remediation advisories via the Microsoft Security Response Center (MSRC). …
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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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