Auth bypass in Trusted Domain Project Opendmarc
CVE-2026-101280
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.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Trusted Domain Project Opendmarc — versions 1.4.0, 1.4.1, 1.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/411037 (technical-description, vdb-entry)
- vuldb.com/vuln/411037/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-101280 (third-party-advisory)
- vuldb.com/submit/918282 (third-party-advisory)
- xuyongzhe-vt.github.io/share/opendmarc-multi-record-downgrade.html (exploit)
Frequently asked questions
- What is CVE-2026-101280?
- CVE-2026-101280 is a high-severity vulnerability in Trusted Domain Project Opendmarc, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-09-29.
- How severe is CVE-2026-101280?
- High severity. CVSS v3 base score is 7.3 out of 10.