EUVD-2026-56297
GHSA-jg9v-rf24-xph9
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Network-reachable and low complexity; PR:L reflects required authentication; I:L added because identity spoofing plausibly enables unauthorized writes or impersonation-driven modifications.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AnalysisAI
Deserialization of untrusted data in Microsoft SharePoint Server exposes networks to spoofing attacks by authenticated low-privileged users. Confirmed affected versions span SharePoint Enterprise Server 2016, SharePoint Server 2019, and the Subscription Edition. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, authenticated network session with at minimum low-privilege access to the SharePoint Server instance - confirmed by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 score reflects a moderate-severity issue driven by a network-reachable vector (AV:N), low attack complexity (AC:L), and low-privilege requirement (PR:L), with high confidentiality impact but no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated SharePoint user - such as a low-privileged employee or contractor with a valid domain account - crafts a malicious serialized payload and submits it to a vulnerable SharePoint endpoint over the network. The server deserializes the payload without sufficient validation, causing the application to process object state controlled by the attacker. … |
| Remediation | Vendor-released patches are available for all three affected product lines. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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