Medium severity · published Oct 2, 2026
CVE-2026-19856
All in One SEO < 5.0.2.1 - Unauthenticated Arbitrary Shortcode Execution via Search Query
6.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AI
All in One SEO ·
before 5.0.2.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19856
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19856
exploit
https://wpscan.com/vulnerability/e35365d3-65de-45a7-9629-17aacd5299c7/
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