CVE-2025-4776: Phlox <= 2.17.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via `data-caption` HTML Attribute

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-06 · updated 2026-10-07
Weakness: CWE-79

Description

The Phlox theme for WordPress is vulnerable to Stored Cross-Site Scripting via the `data-caption` HTML attribute in all versions up to, and including, 2.17.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

averta Phlox PRO: through 2.17.7

References

https://themes.trac.wordpress.org/changeset/300858/
https://www.wordfence.com/threat-intel/vulnerabilities/id/a49f8150-a27d-4801-8923-31af335c3cbd?source=cve

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