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PatchSiren cyber security CVE debrief

CVE-2026-24573 Themeisle CVE debrief

CVE-2026-24573 is a medium-severity stored cross-site scripting issue in the Visualizer WordPress plugin from Themeisle, affecting versions before 4.0.0. Because the flaw is stored XSS, malicious input can be saved and later rendered in a page context, creating risk for users who view the affected content. The NVD record lists the issue as Deferred and links to a Patchstack reference for the affected plugin version range.

Vendor
Themeisle
Product
Visualizer
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-20
Original CVE updated
2026-07-24
Advisory published
2026-05-20
Advisory updated
2026-07-24

Who should care

WordPress site owners, administrators, and editors using the Visualizer plugin should care most, especially sites that allow multiple users to create or manage charts and other plugin-generated content. Security teams should also review any deployment where authenticated users with lower privileges can submit content that is later displayed to higher-privilege users.

Technical summary

The supplied NVD data describes an improper neutralization of input during web page generation (CWE-79) leading to stored XSS in Themeisle Visualizer before version 4.0.0. The CVSS vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates network reachability, low attack complexity, required low privileges, and user interaction. In practical terms, an attacker who can place crafted content into the plugin’s storage or rendering path may cause script execution when another user views the affected page.

Defensive priority

Medium

Recommended defensive actions

  • Upgrade Visualizer to version 4.0.0 or later as soon as possible.
  • If immediate updating is not possible, disable the plugin or restrict who can create and edit Visualizer content.
  • Review existing charts/pages created by the plugin for unexpected scripts, HTML, or event handlers.
  • Apply defense-in-depth controls such as strong output encoding, a restrictive Content Security Policy where feasible, and least-privilege editor/admin access.

Evidence notes

The vulnerability description and affected range come from the supplied CVE record: Visualizer before 4.0.0, stored XSS, CWE-79. The NVD metadata also provides the CVSS v3.1 vector and marks the record as Deferred. The Patchstack reference URL in the source corpus is the only vendor-linked reference supplied for this issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-24573 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-24573

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-24573 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-24573

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.