CVE-2024-26198
Microsoft Exchange Server 2016 … 2019
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSummary
CVE-2024-26198 is a high-severity Untrusted Search Path (CWE-426) vulnerability in Microsoft Exchange Server. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception (T1034); ranked in the top 7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and CM-7 (Least Functionality) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2024-26198 is a remote code execution vulnerability affecting Microsoft Exchange Server. It carries a CVSS 3.1 base score of 8.8 with the vector string AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H and is associated with CWE-426.
An attacker can exploit the flaw over the network without authentication, provided a user performs a required interaction such as clicking a crafted link. Successful exploitation grants the attacker full control over confidentiality, integrity, and availability on the affected Exchange Server.
Microsoft Security Response Center advisories at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26198 describe available patches and mitigation guidance.
EPSS for the CVE rose from low values to a recorded peak of 0.0524 on 2025-12-11 before receding to the current 0.0269, indicating a period of increased exploitation interest after disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-23474
Vulnerability Data
Microsoft Exchange Server Remote Code Execution Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Secure baseline settings can enforce absolute, organization-controlled paths for critical resources.
Least-functionality configuration can prohibit unapproved directories or executables from being reachable via search paths.
Engineering principles such as trusted paths, complete mediation, and least privilege directly require hard-coded or validated search paths instead of external ones.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Preventing execution of unauthorized code directly blocks the malicious binaries that an untrusted search path would load.
Secure development practices include avoiding or sanitizing externally influenced search paths in application code.
Hardened configuration baselines can enforce safe search paths and restrict environment variables that enable the weakness.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can discover search-path issues but does not itself prevent them in production code.
Restricting software installation reduces the chance that untrusted binaries or libraries are placed in search paths.
Secure architecture principles include hard-coded or validated search paths and avoiding reliance on untrusted directories.
Secure coding standards require absolute paths or integrity-checked search paths, directly mitigating CWE-426.
Change-management processes can enforce review of path-handling changes, indirectly lowering risk.