VDB-411038 · Submit #918284 · CVE-2026-101281

Trusted Domain Project OpenDMARC up to 1.4.2 SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6	$0-$5k	1.38-

Summaryinfo

A vulnerability described as critical has been identified in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. Such manipulation leads to improper authentication. This vulnerability is listed as CVE-2026-101281. The attack may be performed from remote. In addition, an exploit is available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Trusted Domain Project OpenDMARC up to 1.4.2. It has been rated as critical. Affected by this issue is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-101281. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

The exploit is available at xuyongzhe-vt.github.io. It is declared as proof-of-concept.

Applying the patch c48a74c758677fc5272a73eff15ffdbf8afda1a6 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Type

Project Management Software

Vendor

Trusted Domain Project

Name

OpenDMARC

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: c48a74c758677fc5272a73eff15ffdbf8afda1a6

Timelineinfo

09/28/2026 Advisory disclosed
09/28/2026 +0 days VulDB entry created
09/28/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: 262
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-101281 (🔒)
GCVE (CVE): GCVE-0-2026-101281
GCVE (VulDB): GCVE-100-411038
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/28/2026 13:58
Changes: 09/28/2026 13:58 (62)
Complete: 🔍
Submitter: yongzhe_xu
Cache ID: 216::103

Submitinfo

Accepted

Submit #918284: The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication (by yongzhe_xu)