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PatchSiren cyber security CVE debrief

CVE-2026-7509 helgatheviking CVE debrief

CVE-2026-7509 is a stored cross-site scripting vulnerability in the KIA Subtitle WordPress plugin for WordPress. According to the NVD description, the issue affects all versions up to and including 4.0.1 and can let authenticated users with Contributor-level access or higher inject script content through the plugin’s `the-subtitle` shortcode attributes.

Vendor
helgatheviking
Product
KIA Subtitle
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-22
Original CVE updated
2026-07-23
Advisory published
2026-05-22
Advisory updated
2026-07-23

Who should care

WordPress site owners and administrators running KIA Subtitle 4.0.1 or earlier, especially sites that allow Contributor-level or higher user content creation.

Technical summary

The vulnerability is caused by insufficient input sanitization and output escaping for the shortcode’s `before` and `after` attributes. Because the issue is stored, malicious input can persist in content and execute when affected pages are viewed. The published CVSS vector indicates network access, low attack complexity, required low privileges, no user interaction, and a changed scope impact profile.

Defensive priority

Medium: this is a stored XSS issue in a WordPress plugin and should be prioritized for prompt patching, content review, and role-based access reduction.

Recommended defensive actions

  • Update KIA Subtitle to a version newer than 4.0.1 as soon as a fixed release is available.
  • Restrict Contributor-level and other content-creation permissions to trusted users only.
  • Review posts and pages using the `the-subtitle` shortcode for unexpected `before` and `after` attribute values.
  • Search for and remove any injected or suspicious script content in affected pages.
  • Clear caches and re-publish cleaned content after remediation.
  • Monitor for abnormal admin, editor, or front-end activity that could indicate stored XSS abuse.

Evidence notes

The NVD record describes the flaw as stored XSS in the KIA Subtitle plugin through the `the-subtitle` shortcode `before` and `after` attributes, affecting versions through 4.0.1. Wordfence-linked references point to plugin source lines in 4.0.1 and to 4.0.2/trunk, supporting the affected-version and remediation context without requiring exploit detail.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7509 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7509

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

  • CVE-2026-7509 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7509

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

Supplemental references

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.