CVE-2026-101280: Trusted Domain Project Opendmarc

High severity, CVSS 7.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability was detected in Trusted Domain Project OpenDMARC up to 1.4.2. Affected is the function opendmarc_policy_query_dmarc of the component Multi-Record Set Handler. The manipulation results in authentication bypass by spoofing. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

Published 2026-09-29. Last modified 2026-09-29.