CVE-2026-101281

Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication

State: Published
Severity: 6.9 Medium
Published: Sep 29, 2026
Updated: Oct 1, 2026
Reserved: Sep 28, 2026

Description

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	7.3 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	7.5 High	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
OpenDMARCTrusted Domain Project	1.4.0Affected 1.4.1Affected 1.4.2Affected

References

VDB-411038 | Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authenticationvdb-entrytechnical-description
VDB-411038 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-101281 | CVE Analysis and Reportthird-party-advisory
Submit #918284 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authenticationthird-party-advisory
https://github.com/trusteddomainproject/OpenDMARC/issues/262issue-tracking
https://github.com/trusteddomainproject/OpenDMARC/pull/328issue-trackingpatch
https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.htmlexploit
https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6patch

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