CVE-2026-70310: Microsoft Word Information Disclosure Vulnerability
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
CSIRTS triage
- What
- An out-of-bounds read in Microsoft Office Word allows disclosure of sensitive information during file processing.
- Who is affected
- Users of Microsoft Office Word who open untrusted files locally.
- Urgency
- Medium urgency; requires local user interaction and no active exploitation reported.
- Action
- Apply the latest security updates for Microsoft Office Word and educate users on file safety practices.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Office Word
Get an email when a new Office Word advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70310
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-703100.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-70310 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Microsoft Office Products: Multiple Vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Microsoft Office (August 12, 2026)cert-fr-avis
- unknownNCSC-2026-0286 [1.00] [M/H] Vulnerabilities patched in Microsoft Officencsc-nl
- mediumCVE-2026-70310: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd
Recent advisories for Microsoft Word Information
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-70319: Improper input validation in Microsoft Office Word allows an unauthorized attacker to disclose…nvd · 2026-08-11
- mediumCVE-2026-70310: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd · 2026-08-11
- mediumCVE-2026-66810: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclos…nvd · 2026-08-11
- mediumCVE-2026-66806: Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose informat…nvd · 2026-08-11
- mediumCVE-2026-64917: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd · 2026-08-11
- mediumCVE-2026-63531: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd · 2026-08-11
More from Microsoft Security Response Center
- highCVE-2026-70130: Microsoft Office Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-70354: .NET Core Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-68792: Microsoft Office Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-66807: Microsoft Office Graphics Component Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11