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🐍 PyPI
Not in CISA KEV
HIGH severity

CVE-2012-5506 — plone

HIGH

CVE-2012-5506 is a high-severity (CVSS 7.5) CWE-399 vulnerability in plone. A fix is available for plone — see the affected versions and patch details below.

Plone denial of service via RSS Feed Request

Also known asPYSEC-2014-48
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
0.10%0.78%1.45%2.12%0.6%1.6%May 26Sep 26Nov 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

2 pkgs affected
🐍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

python_scripts.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to cause a denial of service (infinite loop) via an RSS feed request for a folder the user does not have permission to access.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIploneall versions4.2.3pip install --upgrade 'plone==4.2.3'
🐍PyPIplone≥ 4.3a1&&< 4.3b14.3b1pip install --upgrade 'plone==4.3b1'

Affected Products

1 product · 72 configurations
Application
ploneplone
≤ 4.2.2
65 versions
1.01.0.11.0.21.0.31.0.41.0.51.0.62.02.0.12.0.22.0.32.0.4

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 4.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2012-5506 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

python_scripts.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to cause a denial of service (infinite loop) via an RSS feed request for a folder the user does not have permission to access.
O3 Security · Impact-Aware SCA

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CVE-2012-5506: plone DoS — Fixed in 4.2.3