Is CVE-2026-57671 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-57671 being exploited in the wild.

How severe is CVE-2026-57671?

High severity, with a CVSS score of 7.1, published 2 July 2026.

Which products and versions are affected?

forgemedia LLC perfmatters <= 2.6.4.

Is there a fix for CVE-2026-57671?

A patch was published on 2026-07-02: NVD publication and confirmation of fix in 2.6.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-57671 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-57671?

Check whether anything you run is named in the advisory. 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.

CVE-2026-57671: Perfmatters WordPress plugin unauthenticated XSS

Q: Is there a fix for CVE-2026-57671?

A patch was published on 2026-07-02: NVD publication and confirmation of fix in 2.6.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-57671 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-57671?

Check whether anything you run is named in the advisory. 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.

CVE-2026-57671 · Severity: high · CVSS 7.1 · Published 2026-07-02

Perfmatters, a WordPress plugin used to improve website performance, contains a security vulnerability that allows attackers to inject malicious scripts into the site. If a site administrator or visitor interacts with a specially crafted link or page, the attacker could execute code in their browser. This could lead to unauthorized actions, such as redirecting users to malicious websites or stealing sensitive session information.

Quick answers

Is CVE-2026-57671 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-57671 being exploited in the wild.
How severe is CVE-2026-57671?: High severity, with a CVSS score of 7.1, published 2 July 2026.
Which products and versions are affected?: forgemedia LLC perfmatters <= 2.6.4.
Is there a fix for CVE-2026-57671?: A patch was published on 2026-07-02: NVD publication and confirmation of fix in 2.6.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57671 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-57671?: Check whether anything you run is named in the advisory. 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

A Cross-Site Scripting (XSS) vulnerability exists in the Perfmatters plugin for WordPress (versions 2.6.4 and earlier) due to improper neutralization of user-supplied input during web page generation (CWE-79). The flaw allows an unauthenticated remote attacker to inject malicious scripts into the application. Successful exploitation requires a victim (typically a privileged user) to perform an action, such as clicking a malicious link or visiting a crafted page. Once executed, the attacker's script can perform actions on behalf of the user, access cookies, or redirect the browser. The issue is resolved in version 2.6.5.

Affected products

forgemedia LLC perfmatters <= 2.6.4

Timeline

2026-06-23: disclosed: Reported by researcher daroo
2026-06-30: advisory: Patchstack advisory published
2026-07-02: patched: NVD publication and confirmation of fix in 2.6.5

References

https://patchstack.com/database/wordpress/plugin/perfmatters/vulnerability/wordpress-perfmatters-plugin-2-6-4-cross-site-scripting-xss-vulnerability?_s_id=cve

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