CVE-2026-101280 Trusted Domain Project OpenDMARC - Authentication Bypass

Trusted Domain Project OpenDMARC <= 1.4.2 contains an authentication bypass caused by manipulation in opendmarc_policy_query_dmarc function in Multi-Record Set Handler, letting remote attackers spoof authentication, exploit requires crafted input.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.40% 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

Update to the latest version beyond 1.4.2.

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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