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VulnerabilityPublished

CVE-2026-3604: WP SEO Structured Data Schema · Cross-site Scripting

Affects WP SEO Structured Data SchemaSource CVE Database V5

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Not known to be exploited · CVSS 4.9 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
4.9Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
kcseoproWP SEO Structured Data SchemaAffected
  • <=2.8.1
Fixed in–

AI-suggested

Until an official fix is released, limit Contributor-level access to trusted users only and consider monitoring or restricting use of the _kcseo_ative_tab parameter if possible. Avoid exposing pages that could contain injected scripts to untrusted users. Follow updates from the plugin vendor for an official patch or mitigation instructions.

Description

The WP SEO Structured Data Schema WordPress plugin versions up to and including 2.8.1 contain a stored cross-site scripting (XSS) vulnerability via the _kcseo_ative_tab parameter. This vulnerability arises from insufficient input sanitization and output escaping, allowing authenticated users with Contributor-level access or higher to inject malicious scripts. These scripts execute when other users view the affected pages. The vulnerability has a medium severity with a CVSS score of 4.9. No official patch or remediation guidance has been provided yet, and no known exploits are reported in the wild.

References

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