Microsoft Outlook Spoofing Vulnerability
- Published
- Jul 9, 2024
- Updated
- Jun 17, 2026
- EPSS
- 1.8% · 78th percentile
- CWE
- CWE-200
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
27
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · microsoft
- 6.5
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| microsoft | 365 apps | cpe:2.3:a:microsoft:365_apps |
| microsoft | office | cpe:2.3:a:microsoft:office |
| microsoft | office long term servicing channel | cpe:2.3:a:microsoft:office_long_term_servicing_channel |
| microsoft | outlook | cpe:2.3:a:microsoft:outlook |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- microsoft 365 appsall versions
- microsoft office2016
- microsoft office2019
- microsoft office long term servicing channel2021
- microsoft outlook2016
Versions reported by the vendor
Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.
Microsoft Microsoft 365 Apps for Enterprise
- 16.0.1 and later · before https://aka.ms/OfficeSecurityReleasesaffected
Microsoft Microsoft Office 2016
- 16.0.0 and later · before 16.0.5456.1000affected
Microsoft Microsoft Office 2019
- 19.0.0 and later · before https://aka.ms/OfficeSecurityReleasesaffected
Microsoft Microsoft Office LTSC 2021
- 16.0.1 and later · before https://aka.ms/OfficeSecurityReleasesaffected
Microsoft Microsoft Outlook 2016
- 16.0.0.0 and later · before 16.0.5456.1000affected
Same product
microsoft: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-23397Microsoft Outlook Elevation of Privilege VulnerabilityKEV98Now
- CVE-2024-21413Microsoft Outlook Remote Code Execution VulnerabilityKEV97Now
- CVE-2026-21509Microsoft Office Security Feature Bypass VulnerabilityKEV82Now
- CVE-2021-42292Microsoft Excel Security Feature Bypass VulnerabilityKEV74This week
- CVE-2023-35311Microsoft Outlook Security Feature Bypass VulnerabilityKEV70This week
- CVE-2024-38189Microsoft Project Remote Code Execution VulnerabilityKEV67This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft Office 2016 (32-bit edition) | 16.0.5456.1000 · KB5002620 | Microsoft (MSRC) |
| Microsoft Office 2016 (64-bit edition) | 16.0.5456.1000 · KB5002620 | Microsoft (MSRC) |
| Microsoft Office 2019 for 32-bit editions | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft Office 2019 for 64-bit editions | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft Office LTSC 2021 for 32-bit editions | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft Office LTSC 2021 for 64-bit editions | https://aka.ms/OfficeSecurityReleases · Click to Run | Microsoft (MSRC) |
| Microsoft Outlook 2016 (32-bit edition) | 16.0.5456.1000 · KB5002621 | Microsoft (MSRC) |
| Microsoft Outlook 2016 (64-bit edition) | 16.0.5456.1000 · KB5002621 | Microsoft (MSRC) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2024-3820034 days apartMicrosoft Office Spoofing Vulnerability32Monitor
- CVE-2023-35636210 days apartMicrosoft Outlook Information Disclosure Vulnerability31Monitor
- CVE-2023-36763301 days apartMicrosoft Outlook Information Disclosure Vulnerability31Monitor
- CVE-2024-4360991 days apartMicrosoft Office Spoofing Vulnerability27Monitor
- CVE-2025-59240490 days apartMicrosoft Excel Information Disclosure Vulnerability22Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0914 · Jul 10, 2024(Microsoft Outlook Güvenlik Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-200 · Exposure of Sensitive Information to an Unauthorized ActorCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
nvd-secondary
Root cause
The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.
The bug in code
The whole CWE-200 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
{ "permissions": ["tabs", "<all_urls>"], "background": { "service_worker": "analytics.js" }}Fixed
{ "permissions": ["activeTab"], "host_permissions": ["https://yildiz.example/*"]}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- ExcavationCAPEC-116likelihood: High · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- FootprintingCAPEC-169likelihood: High · Very Low
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- FingerprintingCAPEC-224likelihood: High · Very Low
- ICMP Echo Request PingCAPEC-285likelihood: Medium · Low
- TCP SYN ScanCAPEC-287Low
- Enumerate Mail Exchange (MX) RecordsCAPEC-290Low
ATT&CK techniques
- System Service DiscoveryT1007
- System Network Configuration DiscoveryT1016
- Remote System DiscoveryT1018
- System Owner/User DiscoveryT1033
- Masquerading: Match Legitimate Name or LocationT1036.005
- Network Service ScanningT1046
- System Network Connections DiscoveryT1049
- Process DiscoveryT1057
- Permission Groups DiscoveryT1069
- System Information DiscoveryT1082
- File and Directory DiscoveryT1083
- Account DiscoveryT1087
- Multi-Factor Authentication InterceptionT1111
- Peripheral Device DiscoveryT1120
- System Time DiscoveryT1124
- Access Token Manipulation:Token Impersonation/TheftT1134.001
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.