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PatchSiren cyber security CVE debrief

CVE-2026-42668 Omnisend CVE debrief

CVE-2026-42668 is a high-severity vulnerability in Email Marketing for WooCommerce by Omnisend plugin versions <= 1.18.0, allowing unauthenticated broken authentication. This CVE record was published on 2026-06-15T21:16:56.637Z and was last modified on 2026-10-25T23:10:00.167Z. The NVD entry is currently Deferred.

Vendor
Omnisend
Product
Email Marketing for WooCommerce by Omnisend
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-10-25
Advisory published
2026-06-15
Advisory updated
2026-10-25

Who should care

Defenders responsible for WooCommerce environments using the Email Marketing for WooCommerce by Omnisend plugin should verify exposure and assess potential authentication risks.

Why it matters

CVE-2026-42668 is a high-severity vulnerability in Email Marketing for WooCommerce by Omnisend plugin versions <= 1.18.0, allowing unauthenticated broken authentication. Defenders should verify exposure, assess potential authentication risks, and consider upgrading to a patched version if available.

  • Verify authentication mechanisms in WooCommerce environments using the affected plugin.
  • Assess potential risks related to unauthenticated access.
  • Consider upgrading to a patched version if available.

Technical summary

CVE-2026-42668 is a high-severity vulnerability in Email Marketing for WooCommerce by Omnisend plugin versions <= 1.18.0, allowing unauthenticated broken authentication. The vulnerability has a CVSS score of 7.5 and is classified as CWE-288.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential authentication risks in their WooCommerce environments using the affected plugin.

Recommended defensive actions

  • Verify if WooCommerce environments are using the affected Email Marketing for WooCommerce by Omnisend plugin versions <= 1.18.0.
  • Assess potential authentication risks and consider upgrading to a patched version if available.
  • Monitor for any suspicious activity related to the plugin.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but additional verification is needed to confirm affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42668 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42668

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42668 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42668

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.