Is CVE-2026-15393 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-15393 being exploited in the wild.

How severe is CVE-2026-15393?

Medium severity, with a CVSS score of 6.4, published 28 July 2026.

Which products and versions are affected?

CozyThemes Cozy Blocks <= 2.2.11.

Is there a fix for CVE-2026-15393?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-15393 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-15393?

Check whether you run CozyThemes Cozy Blocks 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.

CVE-2026-15393: Cozythemes Cozy Blocks Stored XSS in postMeta.font.size attribute

Q: Is there a fix for CVE-2026-15393?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-15393 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-15393?

Check whether you run CozyThemes Cozy Blocks 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.

CVE-2026-15393 · Severity: medium · CVSS 6.4 · Published 2026-07-28

The Cozy Blocks plugin for WordPress, which provides design templates and blocks for website building, contains a security flaw. This vulnerability allows users with basic contributor permissions to embed malicious scripts into website pages. When other visitors or administrators view these pages, the scripts execute, potentially leading to unauthorized actions or data theft.

Technologies: CozyThemes Cozy Blocks. Vendors: CozyThemes.

Quick answers

Is CVE-2026-15393 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-15393 being exploited in the wild.
How severe is CVE-2026-15393?: Medium severity, with a CVSS score of 6.4, published 28 July 2026.
Which products and versions are affected?: CozyThemes Cozy Blocks <= 2.2.11.
Is there a fix for CVE-2026-15393?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-15393 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-15393?: Check whether you run CozyThemes Cozy Blocks 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

The Cozy Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'postMeta.font.size' block attribute. The flaw exists in versions up to and including 2.2.11. An authenticated attacker with contributor-level permissions or higher can inject malicious JavaScript into a post or page via this attribute. Because the script is stored on the server, it will execute in the browser context of any user (including administrators) who views the compromised content. This can lead to session hijacking or unauthorized administrative actions.

Affected products

cozythemes Cozy Blocks – Page Builder for Gutenberg Editor & FSE with 600+ Patterns, 58 Blocks & Templates <= 2.2.11

Timeline

2026-07-28: disclosed: Initial publication of the CVE record
2026-07-28: advisory

References

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