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

Quick assessment

Affected

Trusted Domain Project OpenDMARC

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Trusted Domain Project OpenDMARC 1.4.2 及更早版本中发现了一个漏洞。受影响的是“多记录集处理程序”（Multi-Record Set Handler）组件中的函数。该漏洞可通过伪造方式实现身份验证绕过。攻击者可远程执行此漏洞利用。目前该漏洞利用代码已公开，可能被恶意使用。厂商已提前收到此漏洞披露通知，但至今未作出任何回应。

CVSS 7.3 · High Updated Sep 29, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Trusted Domain Project OpenDMARC Multi-Record Set opendmarc_policy_query_dmarc authentication spoofing

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

使用欺骗进行的认证绕过

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Trusted Domain Project	OpenDMARC	1.4.0	`cpe:2.3:a:trusted_domain_project:opendmarc::::::::`

II. Public POCs for CVE-2026-101280

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-101280

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Security Blog Posts for CVE-2026-101280 (1)

🔗 OpenDMARC picks the first record out of an ambiguous _dmarc set, letting an attacker downgrade the policy [OpenDMARC ≤ 1.4.2, latest release checked 2026-07-30] Read full article exploit

https://www.cve.org/CVERecord?id=CVE-2026-101280

Same Patch Batch · Trusted Domain Project · 2026-09-29 · 4 CVEs total

CVE-2026-101281	7.3 HIGH	Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_dom
CVE-2026-101279	6.5 MEDIUM	Trusted Domain Project OpenDMARC opendmarc_policy.c integer overflow
CVE-2026-101278	4.3 MEDIUM	Trusted Domain Project OpenDMARC PSL Wildcard opendmarc_tld.c : opendmarc_get_tld origin v

IV. Related Vulnerabilities

Same product: OpenDMARC

Same vendor: Trusted Domain Project

Same weakness: CWE-290

V. Comments for CVE-2026-101280

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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-101280

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-101280

III. Intelligence Information for CVE-2026-101280

Security Blog Posts for CVE-2026-101280 (1)

Same Patch Batch · Trusted Domain Project · 2026-09-29 · 4 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-101280

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