EUVD-2026-42804
GHSA-gfch-rpr6-7jf3
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Reflected XSS is network-exploitable with no attacker privileges, but requires victim interaction (UI:R); injected script crosses into browser context causing scope change (S:C).
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
The Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the page parameter in all versions up to, and including, 3.1.77 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
AnalysisAI
Reflected Cross-Site Scripting in the Brevo (formerly Sendinblue) Newsletter, SMTP, Email marketing and Subscribe forms WordPress plugin allows unauthenticated remote attackers to inject and execute arbitrary JavaScript in victims' browsers through a crafted URL containing a malicious payload in the page parameter. All plugin versions up to and including 3.1.77 are affected, with the root flaw traced to insufficient input sanitization and output escaping in inc/table-forms.php at line 102. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target WordPress site must have the Brevo (mailin) plugin installed and active at version 3.1.77 or earlier. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 6.1 (Medium) is consistent with a reflected XSS with scope change but required user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a WordPress site running the Brevo plugin at version 3.1.77 or earlier, then crafts a URL embedding a JavaScript payload (e.g., a cookie-stealing script) in the `page` parameter of the affected plugin page. The attacker delivers this URL to a WordPress administrator via a targeted phishing email - plausible given the plugin's email marketing context - and when the administrator clicks the link, the injected script executes in their browser under their authenticated session, enabling the attacker to exfiltrate the admin session cookie or perform privileged actions on the WordPress site. … |
| Remediation | Site administrators should update the Brevo plugin immediately to any version released after 3.1.77. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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