CVE-2026-101281

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 35.0% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-01.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-29 00:45Z1 MO AGO

Last updated

2026-10-01 15:27Z28 DAYS AGO

Reserved

2026-09-28

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

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

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.2

Document digest

ddc34ce6af074d6ae613b9fe11071c83a616fd38db1ebb78b63fa28267c597bc

• vuldb.comVDB-411038 | Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authenticationhttps://vuldb.com/vuln/411038vdb-entrytechnical-description
• vuldb.comVDB-411038 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/411038/ctisignaturepermissions-required
• vuldb.comCVE-2026-101281 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-101281third-party-advisory
• vuldb.comSubmit #918284 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authenticationhttps://vuldb.com/submit/918284third-party-advisory
• github.comhttps://github.com/trusteddomainproject/OpenDMARC/issues/262issue-tracking
• github.comhttps://github.com/trusteddomainproject/OpenDMARC/pull/328issue-trackingpatch
• xuyongzhe-vt.github.iohttps://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.htmlexploit
• github.comhttps://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6patch