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HIGH severity

Improper Restriction of XML External Entity Reference in PloneGHSA-wq6x-g685-w5f2

HIGH

GHSA-wq6x-g685-w5f2 is a high-severity (CVSS 8.8) XML External Entity (XXE) vulnerability in plone. A fix is available for plone — see the affected versions and patch details below.

Also known asCVE-2020-28734PYSEC-2020-246PYSEC-2026-2880PYSEC-2026-2883PYSEC-2026-2886PYSEC-2026-736
Published
Updated
Affected
5 pkgs
Patched
5 / 5
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.00%0.65%1.30%1.95%0.5%1.5%Jun 26Sep 26Oct 26

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

How urgent is this, really

GHSA-wq6x-g685-w5f2 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

5 pkgs affected
🐍plone🐍plone-app-event🐍plone-app-theming🐍plone-app-dexterity🐍plone-supermodel

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

Plone before 5.2.3 allows XXE attacks via a feature that is explicitly only available to the Manager role.

Affected Packages

5 total 5 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIploneall versions5.2.3pip install --upgrade 'plone==5.2.3'
🐍PyPIplone-app-eventall versions3.2.10pip install --upgrade 'plone-app-event==3.2.10'
🐍PyPIplone-app-themingall versions4.1.6pip install --upgrade 'plone-app-theming==4.1.6'
🐍PyPIplone-app-dexterityall versions2.6.8pip install --upgrade 'plone-app-dexterity==2.6.8'
🐍PyPIplone-supermodelall versions1.6.3pip install --upgrade 'plone-supermodel==1.6.3'

Affected Products

1 product · 1 configurations
Application
ploneplone
< 5.2.3
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 5.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wq6x-g685-w5f2 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Plone before 5.2.3 allows XXE attacks via a feature that is explicitly only available to the Manager role.
O3 Security · Impact-Aware SCA

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