Quick answers
- Is CVE-2026-78519 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78519 being exploited in the wild.
- How severe is CVE-2026-78519?
- High severity, with a CVSS score of 8.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Office Outlook.
- Is there a fix for CVE-2026-78519?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-78519 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-78519?
- Check whether you run Microsoft Office Outlook. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability involves the use of uninitialized resource in Microsoft Office Outlook, which can be exploited through network-based attack vectors. An attacker can craft malicious input that triggers the uninitialized resource condition, leading to code execution with the privileges of the Outlook process. The vulnerability is remotely exploitable without requiring user authentication or special preconditions beyond receiving or opening a malicious message. A patch is expected to be available through Microsoft's security update process.
Affected products
- Microsoft Office Outlook
Timeline
- 2026-09-08: disclosed