CVE-2026-42668Network attack vector

Account takeover via predictable connection token

Published Jun 15, 2026 · Updated Jun 15, 2026

Broken authentication in Email Marketing for WooCommerce by Omnisend 1.18.0 and earlier allows remote attackers to take over an account. The store-connection endpoint accepts predictable connection tokens, and distinct invalid-token responses disclose whether a candidate token is valid. No WordPress account is required; a valid guessed token permits access to the linked Omnisend account, with no reported code execution or service interruption.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken authentication in Email Marketing for WooCommerce by Omnisend 1.18.0 and earlier allows remote attackers to take over an account. The store-connection endpoint accepts predictable connection tokens, and distinct invalid-token responses disclose whether a candidate token is valid. No WordPress account is required; a valid guessed token permits access to the linked Omnisend account, with no reported code execution or service interruption.

The record

CVE
CVE-2026-42668
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Omnisend
Product
Email Marketing for WooCommerce by Omnisend
Classifications
CWE-288, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=1.18.0 changes=[{"at":"1.18.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Omnisend · Email Marketing for WooCommerce by Omnisendversion=n/a <=1.18.0 changes=[{"at":"1.18.1","status":"unaffected"}]

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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