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MEDIUM severity

CVE-2020-7936 — plone

MEDIUM

CVE-2020-7936 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in plone. A fix is available for plone — see the affected versions and patch details below.

Plone Open Redirect Vulnerability

Also known asGHSA-82j9-wfcf-9v2hPYSEC-2020-85
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Oct 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs60th percentile — riskier than 60% of all scored CVEsHighest risk
0.00%0.47%0.95%1.42%0.3%0.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐍plone🐍plone🐍plone

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

An open redirect on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIplone≥ 4.0&&< 4.3.204.3.20pip install --upgrade 'plone==4.3.20'
🐍PyPIplone≥ 5.0rc1&&< 5.1.75.1.7pip install --upgrade 'plone==5.1.7'
🐍PyPIplone≥ 5.2.0&&< 5.2.25.2.2pip install --upgrade 'plone==5.2.2'

Affected Products

1 product · 1 configurations
Application
ploneplone
≥ 4.0.0 && ≤ 5.2.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for plone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update plone to 4.3.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-7936 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

An open redirect on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site.
O3 Security · Impact-Aware SCA

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CVE-2020-7936: plone Open Redirect — Fixed in 4.3.20