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Vulnerability · Published Sep 29, 2026 · Assigned by VulDB

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

High 7.3

In plain English

A high-severity authentication bypass by spoofing in OpenDMARC from Trusted Domain Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.4%top 65.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opendmarcno fix listedDEBIAN-CVE-2026-101280
Debian:13opendmarcno fix listedDEBIAN-CVE-2026-101280
Debian:14opendmarcno fix listedDEBIAN-CVE-2026-101280
Ubuntu:22.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101280
Ubuntu:24.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101280
Ubuntu:26.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101280
Ubuntu:26.10opendmarcno fix listedUBUNTU-CVE-2026-101280

Affected products (as reported)

VendorProductVersions
Trusted Domain Project OpenDMARC 1.4.01.4.11.4.2

Weakness: CWE-290, CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References