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All in One SEO < 5.0.2.1 - Unauthenticated Arbitrary Shortcode Execution via Search Query

Type: advisorySource: Official CVE List1 source record

The All in One SEO WordPress plugin before 5.0.2.1 does not correctly determine which shortcodes are present in content derived from user input before deciding which ones to strip, allowing unauthenticated users to execute arbitrary shortcodes registered on the site. On sites upgraded from older versions the protection is disabled outright, making the issue reachable without any crafted input.

Announced Source revision 1
Original source ↗

CVE-2026-19856

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-19856

All in One SEO

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Unknown",
    "product": "All in One SEO",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "5.0.2.1",
        "versionType": "semver"
      }
    ],
    "collectionURL": "https://wordpress.org/plugins",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-19856

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#11624 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement