# CVE-2021-30185: PYSEC-2021-18 - CERN Indico before 2.3.4 can use an attacker-supplied Host header in a password reset link.

Source: https://junglewise.ai/threats/cve-2021-30185-indico-tampering-with-links-e-g-password-reset-in-sent-emails  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-04-07  
License: CC BY 4.0 with a link back

CVE-2021-30185 · Severity: low · CVSS 3.1 · Published 2021-04-07

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

Technologies: [indico (PyPI)](https://junglewise.ai/threats/technologies/indico). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2021-30185 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-30185 being exploited in the wild.

**How severe is CVE-2021-30185?** Low severity, with a CVSS score of 3.1, published 7 April 2021.

**Which products and versions are affected?** indico (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.4.

**Is there a fix for CVE-2021-30185?** Yes. indico (PyPI): upgrade to 2.3.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-30185?** Check whether you run indico (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- indico (PyPI): upgrade to 2.3.4 or later

  ```sh
  pip install "indico>=2.3.4"
  ```


## Affected products

- indico (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.4

## Identifiers

- CVE-2021-30185
- GHSA-wgpj-7c2j-vfjm
- PYSEC-2021-18

## Related threats

- [Indico Cross-Site-Scripting in minutes editor](https://junglewise.ai/threats/cve-2026-107397-indico-cross-site-scripting-in-minutes-editor)
- [Indico cross-site scripting in link fields](https://junglewise.ai/threats/cve-2026-107396-indico-cross-site-scripting-in-link-fields)
- [Indico missing access check in legacy session export API](https://junglewise.ai/threats/cve-2026-107395-indico-missing-access-check-in-legacy-session-export-api)
- [Indico incomplete SSRF check in URL validation](https://junglewise.ai/threats/cve-2026-107394-indico-incomplete-server-side-request-forgery-ssrf-check)
- [PYSEC-2026-1461 - Indico vulnerable to Cross-Site Scripting via LaTeX math code](https://junglewise.ai/threats/cve-2025-59035-indico-vulnerable-to-cross-site-scripting-via-latex-math-code)