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Medium, CVSS 6.9amended

Chameleon in Plone allows Authentication Bypass

CVE-2016-4043GHSA-6h8x-73fx-q2h9

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI plone

    Affected
    >= 5.0rc1, <= 5.0.4>= 5.1a1, <= 5.1a1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2016-4043: 1.01% estimated exploitation activity in the next 30 days; percentile 63.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Chameleon (five.pt) in Plone 5.0rc1 through 5.1a1 allows remote authenticated users to bypass Restricted Python by leveraging permissions to create or edit templates.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-6h8x-73fx-q2h9

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-6h8x-73fx-q2h9

Agent brief

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

# Patch Next advisory brief: CVE-2016-4043

Advisory: Chameleon in Plone allows Authentication Bypass
IDs: CVE-2016-4043, GHSA-6h8x-73fx-q2h9
Record: https://patchnext.com/advisories/cve-2016-4043 (revision 3, source checked 26 Oct 2026, 13:22 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI plone: affected >= 5.0rc1, <= 5.0.4; >= 5.1a1, <= 5.1a1

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

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on plone.
- 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-6h8x-73fx-q2h9 (OSV record GHSA-6h8x-73fx-q2h9 lists affected ranges: PyPI plone >=5.0rc1 <=5.0.4)
- Verified: https://github.com/advisories/GHSA-6h8x-73fx-q2h9 (GitHub-reviewed advisory GHSA-6h8x-73fx-q2h9 lists affected ranges: PyPI plone >=5.0rc1 =5.1a1 <=5.1a1)

Commands are suggestions: review each one before running it.

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