CVE-2026-56193
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedOut-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an out-of-bounds read vulnerability in Microsoft Office that allows a local attacker to read sensitive information from memory beyond intended boundaries. The flaw enables unauthorized information disclosure without executing arbitrary code, classified as a High-severity issue due to the potential for exposing sensitive data.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Microsoft Office product and versionOpen any Office application (Word, Excel, PowerPoint), go to File > Account > About [App] or use 'winword /?' from command prompt to retrieve the exact version numberAffected if The installed version falls within the affected version range for this CVE (compare your version against official Microsoft security advisory)
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Determine Office update channel and last installed security patchGo to File > Account > Update Options > Update Now in any Office app, or check Windows Update history for recent Office security patchesAffected if Office is not updated to the latest security version or no patch addressing this CVE has been installed
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Check if OLE or legacy file format handling is enabledIn Excel, go to File > Options > Trust Center > Trust Center Settings > External Content; in Word go to File > Options > Trust Center > Trust Center Settings > Security Options. Review settings for Object Linking and Embedding and legacy file formatsAffected if OLE embedding or legacy file format handling is enabled and untrusted files can be opened
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Inspect recent Office file handling activityReview Windows Event Viewer under Applications and Services Logs > Microsoft > Office for recent file open events, or check file metadata of recently opened Office documentsAffected if Untrusted or externally sourced Office files have been opened recently
You are affected if your Microsoft Office version is within the vulnerable range and you open specially crafted Office files from untrusted sources.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply Microsoft Office security updates immediately upon release. Until a patch is available, consider restricting Office file handling from untrusted sources and implementing application allowlisting to reduce attack surface.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-56193 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-56193 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data