CVE-2016-7136: Plone Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-22jm-p2vv-j2hc
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2016-7136 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Plone libraries in the PyPI ecosystem. The issue involves plone xss. Remediation is available in the latest vendor maintenance releases.

CVE-2016-7136 at a Glance

CVE Identifier CVE-2016-7136
GHSA Identifier GHSA-22jm-p2vv-j2hc
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Plone
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2016-7136

To remediate this vulnerability, upgrade all affected Plone dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Plone fixed: Latest secure release 
pip install Plone>=Latest secure release
Plone fixed: Latest secure release 
pip install Plone>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show Plone

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2016-7136, inspect your installed packages using pip:

pip show Plone

Analyze the terminal output to locate any version of Plone in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show Plone command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Plone, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

z3c.form in Plone CMS 5.x through 5.0.6 and 4.x through 4.3.11 allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted GET request.

CVE-2016-7136 Affected Plone Versions

2 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
Plone
pypi/Plone
PyPI
≥ 5.0.0
≤ 5.0.6
Plone
pypi/Plone
PyPI
≥ 4.0.0
≤ 4.3.11

References

NVD — CVE-2016-7136 NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-7136
Plone Source Repository REPOSITORY
https://github.com/plone/Plone
Plone Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2017-59.yaml
Plone Security Information SECURITY
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-forms
Plone Security Information SECURITY
https://web.archive.org/web/20210625091607/http://www.securityfocus.com/bid/92752
Plone Security Information SECURITY
https://web.archive.org/web/20210625092107/http://www.securityfocus.com/archive/1/539572/100/0/threaded
Plone Security Information SECURITY
http://packetstormsecurity.com/files/139110/Plone-CMS-4.3.11-5.0.6-XSS-Traversal-Open-Redirection.html
seclists.org/fulldisclosure/2016... WEB
http://seclists.org/fulldisclosure/2016/Oct/80
Plone Security Information SECURITY
http://www.openwall.com/lists/oss-security/2016/09/05/4
Plone Security Information SECURITY
http://www.openwall.com/lists/oss-security/2016/09/05/5

Frequently Asked Questions

What is CVE-2016-7136?
CVE-2016-7136 is a security vulnerability in Plone involving Plone XSS under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Plone versions are affected?
Affected versions include releases prior to current release patches across affected packages: Plone.
What version fixes CVE-2016-7136?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is Plone affected?
Yes, Plone is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2016-7136?
CVE-2016-7136 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2016-7136?
CVE-2016-7136 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check PyPI dependencies for CVE-2016-7136?
Run the dependency tree command: 'pip show Plone'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-22jm-p2vv-j2hc",
  "modified" : "2024-10-15T17:23:02Z",
  "published" : "2022-05-14T02:46:11Z",
  "aliases" : [ "CVE-2016-7136" ],
  "summary" : "Plone XSS",
  "details" : "z3c.form in Plone CMS 5.x through 5.0.6 and 4.x through 4.3.11 allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted GET request.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Plone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "last_affected" : "5.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Plone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "last_affected" : "4.3.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2016-7136"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/plone/Plone"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2017-59.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-forms"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20210625091607/http://www.securityfocus.com/bid/92752"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20210625092107/http://www.securityfocus.com/archive/1/539572/100/0/threaded"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/139110/Plone-CMS-4.3.11-5.0.6-XSS-Traversal-Open-Redirection.html"
  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2016/Oct/80"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2016/09/05/4"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2016/09/05/5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-31T18:51:11Z",
    "nvd_published_at" : "2017-03-07T16:59:00Z"
  }
}