- Published
- Source
- Help Net Security
- Filed under
- Zero-days, Microsoft, Malware & exploits
- Vulnerabilities
- 1 CVE
Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and attachments of other users in the same organization, but “does not allow access across tenant boundaries.” CVE-2026-96940 was discovered internally and, according to the Exchange Server Team, they “are…
If you run the affected product
- Find every instance – especially the ones reachable from the internet.
- Apply the vendor's patch or mitigation now: exploited flaws are fixed in days, not at the next patch cycle.
- Then check for signs it was used before you patched: web shells, new accounts, unusual outbound traffic.
More helpCISA's Known Exploited Vulnerabilities catalogue (opens in a new tab)
The vulnerabilities in this story
CVE-2026-96940 in the NVD (opens in a new tab)
- CVSS8.8High
- CISA KEVNot listedno confirmed exploitation on CISA’s list (yet)
Exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog (CC0). Exploit prediction: EPSS by FIRST. This product uses the NVD API but is not endorsed or certified by the NVD.
MyCyberWay training
Blue Team Analyst · Vulnerability Management
You can't patch everything at once. Learn what to fix first.
In our Blue Team Analyst programme you run a vulnerability scan, prioritise the output with CVSS, EPSS and asset criticality, and track remediation to closure with the teams who own the fix.
- Read scanner output properly
- Prioritise with CVSS, EPSS and asset criticality
- Track remediation to closure
Headlines and short summaries only, except where a public body publishes under an open licence. Every story links to its publisher, who owns it. MyCyberWay does not edit or endorse third-party reporting.
