open redirect in pollbot

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2022-0637: 0.43% estimated exploitation activity in the next 30 days; percentile 37.21 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

(From https://bugzilla.mozilla.org/showbug.cgi?id=1753838) Summary: There was an open redirection vulnerability in the path of: https://pollbot.services.mozilla.com/ and https://pollbot.stage.mozaws.net/ Description: An attacker can redirect anyone to malicious sites. Steps To Reproduce: Type in this URL: https://pollbot.services.mozilla.com/%0a/evil.com/ It redirects to that website evil.com evil.com was used as an example but this could be any website. Note, the /%0a/ and trailing / are required. Supporting Material/References: https://cheatsheetseries.owasp.org/cheatsheets/UnvalidatedRedirectsandForwardsCheatSheet.html Impact Attackers can serve malicious websites that steal passwords or download ransomware to their victims machine due to a redirect and there are a heap of other attack vectors.

Published by the source

16 Feb 2022, 23:02 UTC

Last modified by the source

6 Jul 2026, 08:11 UTC

Source last checked

26 Oct 2026, 13:11 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vg27-hr3v-3cqv

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-vg27-hr3v-3cqv

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2022-0637

Advisory: open redirect in pollbot
IDs: CVE-2022-0637, GHSA-vg27-hr3v-3cqv
Record: https://patchnext.com/advisories/cve-2022-0637 (revision 2, source checked 26 Oct 2026, 13:11 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pollbot 1.4.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI pollbot: affected < 1.4.6; fixed in 1.4.6

## Suggested inspection (read-only)
- `python -m pip show pollbot`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pollbot.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vg27-hr3v-3cqv (OSV record GHSA-vg27-hr3v-3cqv lists affected ranges: PyPI pollbot >=0 <1.4.6 (fixed))
- Verified: https://github.com/advisories/GHSA-vg27-hr3v-3cqv (GitHub-reviewed advisory GHSA-vg27-hr3v-3cqv lists affected ranges: PyPI pollbot >=0 <1.4.6)

Commands are suggestions: review each one before running it.