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TI-2026-65800 Aliases CVE-2026-19856GHSA-f9q5-f8p2-3w5w

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

Priority LOW 34CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00183 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed All in One SEO (Unknown): 5.0.2.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownAll in One SEObefore 5.0.2.15.0.2.1Patch availableCNA
  • All in One SEO VendorUnknown Affected before 5.0.2.1 Fixed in 5.0.2.1 Patch available CNA

Remediation

  • Fix · CNA All in One SEO (Unknown) Fixed in 5.0.2.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-19856
  2. 2026-10-03 Alias added: GHSA-f9q5-f8p2-3w5w
  3. 2026-10-04 Priority changed: MEDIUM → LOW
  4. 2026-10-07 Weakness changed · CISA ADP
  5. 2026-10-07 CISA SSVC decision points changed

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences