CVE-2026-101280: Trusted Domain Project OpenDMARC Multi-Record Set opendmarc_policy_query_dmarc authentication spoofing

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-29 · updated 2026-09-29
Weakness: CWE-287

Description

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

Trusted Domain Project OpenDMARC: 1.4.0, 1.4.1, 1.4.2

References

https://vuldb.com/cve/CVE-2026-101280
https://vuldb.com/submit/918282
https://vuldb.com/vuln/411037
https://vuldb.com/vuln/411037/cti
https://xuyongzhe-vt.github.io/share/opendmarc-multi-record-downgrade.html

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