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CVE-2026-88175

MEDIUM 6.5

Published 2026-10-13 · Last modified 2026-10-25

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.8%chance of exploitation in 30 days · 57th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

6.5CVSS 3.1 · MEDIUM

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: A user must take an action (click / open a file)
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Data snapshot:

Affected

Vendors Microsoft

Products Microsoft 365 Apps For Enterprise Microsoft Office 365 For Mac Microsoft Office Ltsc 2021 Microsoft Office Ltsc 2024 365 Apps Microsoft 365 Office 2021 Office 2024

Weakness (CWE)

  • CWE-125: : Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

References and research data (JSON)

Known Affected Software Configurations

VendorProductVersion range
Microsoft365 Apps*
Microsoft365 Apps*
MicrosoftMicrosoft 365*
MicrosoftOffice 2021*
MicrosoftOffice 2021*
MicrosoftOffice 2024*
MicrosoftOffice 2024*

All CVSS metrics

  • MEDIUM 6.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
  • MEDIUM 6.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

Patches & mitigations

Advisories

Sources: NVD · CVE.org · EPSS