CVE-2026-21511
Microsoft Outlook Spoofing Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 16.106.26020821, 16.0.5539.1002, 16.0.10417.20097, 16.0.19127.20518
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Microsoft Microsoft 365 Apps for Enterprise
From 16.0.1
- Microsoft Microsoft Office 2019
From 19.0.0
- Microsoft Microsoft Office LTSC 2021
From 16.0.1
- Microsoft Microsoft Office LTSC 2024
From 16.0.0
- Microsoft Microsoft Office LTSC for Mac 2021
From 16.0.1 · fixed in 16.106.26020821
- Microsoft Microsoft Office LTSC for Mac 2024
From 16.0.0 · fixed in 16.106.26020821
- Microsoft Microsoft SharePoint Enterprise Server 2016
From 16.0.0 · fixed in 16.0.5539.1002
- Microsoft Microsoft SharePoint Server 2019
From 16.0.0 · fixed in 16.0.10417.20097
- Microsoft Microsoft SharePoint Server Subscription Edition
From 16.0.0 · fixed in 16.0.19127.20518
- Microsoft Microsoft Word 2016
From 16.0.1 · fixed in 16.0.5539.1002