---
id: CVE-2021-41124
aliases:
  - GHSA-823f-cwm9-4g74
  - PYSEC-2021-364
title: 'Splash authentication credentials potentially leaked to target websites '
summary: 'Splash authentication credentials potentially leaked to target websites '
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N'
vendor: scrapy-splash
product: scrapy-splash
ecosystem: pip
affected:
  - scrapy-splash < 0.8.0
patched:
  - scrapy-splash 0.8.0
published: '2021-10-06'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-823f-cwm9-4g74'
references:
  - url: >-
      https://github.com/scrapy-plugins/scrapy-splash/security/advisories/GHSA-823f-cwm9-4g74
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41124'
  - url: >-
      https://github.com/scrapy-plugins/scrapy-splash/commit/2b253e57fe64ec575079c8cdc99fe2013502ea31
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/scrapy-splash/PYSEC-2021-364.yaml
  - url: 'https://github.com/scrapy-plugins/scrapy-splash'
  - url: 'https://github.com/scrapy-plugins/scrapy-splash/releases/tag/0.8.0'
tags:
  - osv
  - pip
epss: 0.01122
epssPercentile: 0.64801
ingestedAt: '2026-07-08T18:25:47.261Z'
---

## Overview

### Impact

If you use [`HttpAuthMiddleware`](http://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpauth) (i.e. the `http_user` and `http_pass` spider attributes) for Splash authentication, any non-Splash request will expose your credentials to the request target. This includes `robots.txt` requests sent by Scrapy when the `ROBOTSTXT_OBEY` setting is set to `True`.

### Patches

Upgrade to scrapy-splash 0.8.0 and use the new `SPLASH_USER` and `SPLASH_PASS` settings instead to set your Splash authentication credentials safely.

### Workarounds

If you cannot upgrade, set your Splash request credentials on a per-request basis, [using the `splash_headers` request parameter](https://github.com/scrapy-plugins/scrapy-splash/tree/0.8.x#http-basic-auth), instead of defining them globally using the [`HttpAuthMiddleware`](http://doc.scrapy.org/en/latest/topics/downloader-middleware.html#module-scrapy.downloadermiddlewares.httpauth).

Alternatively, make sure all your requests go through Splash. That includes disabling the [robots.txt middleware](https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#topics-dlmw-robots).

### For more information
If you have any questions or comments about this advisory:
* [Open an issue](https://github.com/scrapy-plugins/scrapy-splash/issues)
* [Email us](mailto:opensource@zyte.com)


## Affected packages

- `scrapy-splash < 0.8.0`

## Remediation

Upgrade to a patched release:

- `scrapy-splash 0.8.0`