CVE-2026-3604

MEDIUMNVD 4.94.9—

4.9

The WP SEO Structured Data Schema plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the _kcseo_ative_tab parameter in all versions up to, and including, 2.8.1 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.

CVSS v3: 4.9
EG Score: 4.9(high)
EPSS: 11.2%
KEV: Not listed

Published

May 12, 2026

Last Modified

May 12, 2026

References (5)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 16× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
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2026-05-29 13:44 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
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2026-05-27 13:40 UTCepss_batch
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2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
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2026-05-20 22:38 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 13:02 UTCEG score recompute
2026-05-20 13:02 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-3604?

CVE-2026-3604 is a medium vulnerability published on May 12, 2026. The WP SEO Structured Data Schema plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the kcseoative_tab parameter in all versions up to, and including, 2.8.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with…

When was CVE-2026-3604 disclosed?

CVE-2026-3604 was first published in the National Vulnerability Database on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-3604 actively exploited?

CVE-2026-3604 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-3604?

CVE-2026-3604 has a CVSS v3 base score of 4.9 (NVD).

How do I remediate CVE-2026-3604?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3604, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-3604

📅 Published

🔄 Last Modified

🔗 References (5)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-3604?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (5)

Frequently asked(5)

Related CVEs(same CWE)