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CVE-2026-16268

High

Description

The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.

SeverityHigh
CVSS8.2
Exploit probability—
ProductNewsletters
PublishedAug 6, 2026
First seenAug 6, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update
  • Newsletters4.16 or later

Affected products

ProductAffected versionsFixed in
Newslettersv < 4.164.16

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