CVE-2026-66707Network attack vectorHinoki check available

Unauthenticated reflected XSS via inline dismissal URL

Published Aug 6, 2026 · Updated Aug 6, 2026

Reflected XSS in Meta for WooCommerce 3.7.5 and earlier allows remote attackers to execute script in an administrator's browser. The wpcom_update_notice method embeds its dismissal URL in an inline onClick JavaScript string without context-appropriate encoding. Exploitation requires an administrator to open a crafted URL while the WordPress.com update notice is rendered, after which script runs with that administrator's browser privileges.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Reflected XSS in Meta for WooCommerce 3.7.5 and earlier allows remote attackers to execute script in an administrator's browser. The wpcom_update_notice method embeds its dismissal URL in an inline onClick JavaScript string without context-appropriate encoding. Exploitation requires an administrator to open a crafted URL while the WordPress.com update notice is rendered, after which script runs with that administrator's browser privileges.

The record

CVE
CVE-2026-66707
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Meta Platforms, Inc.
Product
Meta for WooCommerce
Classifications
CWE-79, CAPEC-591, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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 <=3.7.5 changes=[{"at":"3.7.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · Meta for WooCommerceversion=n/a <=3.7.5 changes=[{"at":"3.7.6","status":"unaffected"}]

Published CVSS scores

7.1Patchstack CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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