CVE-2026-118152: Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-118152 is a spoofing vulnerability in Microsoft Exchange Server, rated Important by Microsoft, with a CVSS 3.1 base score of 6.5 (Medium). An attacker can exploit it remotely over the network, without any privileges and only if a user takes an action. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. The EPSS model estimates a 0.39% probability of exploitation activity in the next 30 days, higher than 33% of all scored vulnerabilities. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday, delivered through 1 security update (KB5133453). It affects 1 product in 1 product family (Server Software).
Key facts
- CVE ID
- CVE-2026-118152
- Severity
- Medium CVSS 6.5
- Microsoft severity
- Important
- Impact
- Spoofing
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-352
- EPSS
- 0.39% (percentile 33%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Server Software
CVSS score and vector
Microsoft scores CVE-2026-118152 at 6.5 (temporal 5.7) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | High |
| Availability impact | None |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Cross-site request forgery (csrf) in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Affected products (1)
Server Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft Exchange Server Subscription Edition RTM | KB5133453 | Security Update | 15.02.2562.057 | Yes |
Security updates (1)
- KB5133453 (Security Update)
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 6.5 (MEDIUM)
- NVD weakness
- CWE-352
- Published to NVD
- NVD last modified
References
Acknowledgments
- polidinh
- Stanley Tobias
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |