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MEDIUM severity

CVE-2012-5497 — plone

MEDIUMFix: plone/Products.CMFPlone@a9479a5

CVE-2012-5497 is a medium-severity (CVSS 5.3) Information Exposure vulnerability in plone. A fix is available for plone — see the affected versions and patch details below.

Plone User account enumeration via crafted URL

Also known asPYSEC-2014-39
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.00%0.88%1.77%2.65%0.4%2.1%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

membership_tool.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to enumerate user account names via a crafted URL.

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-2012-5497 is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow
ProductFixed inAdvisory
Red Hat Enterprise Linux 5conga-0:0.12.2-81.el5RHSA-2014:1194

Frequently Asked Questions

membership_tool.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to enumerate user account names via a crafted URL.
O3 Security · Impact-Aware SCA

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CVE-2012-5497: plone — Fixed in 4.2.3