CVE-2026-101280 Trusted Domain Project OpenDMARC Multi-Record Set opendmarc_policy_query_dmarc authentication spoofing
Remote attackers can bypass DMARC authentication via spoofing in OpenDMARC, allowing unauthorized email validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101280?
CVE-2026-101280 is a medium-severity authentication bypass vulnerability in Trusted Domain Project OpenDMARC, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-101280?
How do I fix CVE-2026-101280?
No fix has been published for CVE-2026-101280 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-101280 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101280 exists.
Sources
Also known as DEBIAN-CVE-2026-101280, GHSA-fwhq-23fv-8x97, UBUNTU-CVE-2026-101280.