What is CVE-2026-66141?

CVE-2026-66141 is a high-severity vulnerability in Exim, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.4/10. Published 2026-07-24.

How severe is CVE-2026-66141?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Exim

CVE-2026-66141

Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Exim — versions 4.82

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-66141?: CVE-2026-66141 is a high-severity vulnerability in Exim, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.4/10. Published 2026-07-24.
How severe is CVE-2026-66141?: High severity. CVSS v3 base score is 7.4 out of 10.