EUVD-2026-35537
GHSA-whhp-jpfm-6hhm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft Office Excel allows remote unauthenticated attackers to read out-of-bounds memory over a network, potentially exposing sensitive data from process memory. The CVSS 8.2 score reflects high confidentiality impact with no authentication or user interaction required per the CVSS vector. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim's Excel process to parse an attacker-supplied workbook containing a malformed record that triggers the out-of-bounds read; despite the CVSS UI:N rating, the description's reference to Office Excel parsing strongly implies document delivery is the realistic vector, so practical exploitation depends on a user opening the crafted file (or a server-side Excel parser such as Office Online Server / Excel Services processing it). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector AV:N/AC:L/PR:N/UI:N rates the issue as network-reachable, low-complexity, unauthenticated, and without user interaction, yielding a score of 8.2 driven by C:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a crafted Excel workbook to a target user (or hosts it on a SharePoint/web location); when the document is opened, the malformed record triggers the out-of-bounds read and exfiltrates fragments of Excel process memory - potentially containing recently opened document contents, credentials, or pointers - back through embedded data channels or to the attacker via subsequent interaction. No public exploit identified at time of analysis, but the disclosed memory could be used to bootstrap ASLR bypass for a follow-on memory-corruption RCE. |
| Remediation | Patch available per vendor advisory - apply the security update referenced on the MSRC page at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44822 for the affected Excel channel and build as soon as it is available through Windows Update, Microsoft Update, or your enterprise patch management system; exact fix build numbers were not supplied in this dataset and should be confirmed against the MSRC entry. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit and inventory all Excel installations; isolate high-risk systems processing sensitive data. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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