CVE-2026-101281 Trusted Domain Project OpenDMARC - Authentication Bypass

Trusted Domain Project OpenDMARC <= 1.4.2 contains an authentication bypass caused by improper handling in opendmarc_sp2_find_mailfrom_domain function in SPF Macro Handler, letting remote attackers bypass authentication, exploit requires crafted input.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.41% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Apply the patch c48a74c758677fc5272a73eff15ffdbf8afda1a6 or update to a fixed version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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