Quick answers
- Is CVE-2026-66606 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66606 being exploited in the wild.
- How severe is CVE-2026-66606?
- High severity, with a CVSS score of 7.1, published 20 August 2026.
- Which products and versions are affected?
- ThemeGrill SmartSMTP <=1.2.0.
- Is there a fix for CVE-2026-66606?
- A patch was published on 2026-08-19: Version 1.2.1 or later available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-66606 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-66606?
- Check whether you run ThemeGrill SmartSMTP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a stored or reflected cross-site scripting (XSS) vulnerability in the SmartSMTP WordPress plugin affecting versions 1.2.0 and earlier. The vulnerability requires an unauthenticated attacker to craft a malicious input, but successful exploitation requires user interaction (e.g., a privileged user clicking a malicious link or visiting a crafted page). The attacker can inject arbitrary JavaScript that executes in victims' browsers, enabling data theft or account hijacking. A patch is available in version 1.2.1 and later.
Affected products
- ThemeGrill SmartSMTP <=1.2.0
Timeline
- 2026-08-19: disclosed
- 2026-08-19: patched: Version 1.2.1 or later available