How severe is CVE-2011-4924?

CVE-2011-4924 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2011-4924?

CVE-2011-4924 affects the following packages: zope (PyPI), zope2 (PyPI), zope2 (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2011-4924?

Update zope to 3.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2011-4924 is resolved across your whole dependency graph.

How do I detect CVE-2011-4924 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zope, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2011-4924 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2011-4924 actively exploited in the wild?

No public exploit code has been indexed for CVE-2011-4924 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2011-4924?

CVE-2011-4924 has an EPSS (Exploit Prediction Scoring System) score of 1.4%, placing it in the 72th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2011-4924?

CVE-2011-4924 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2011-4924 published, and has it been updated?

CVE-2011-4924 was published on April 22, 2022 and was last updated on July 13, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍

🐍 PyPI

Not in CISA KEV

MEDIUM severity

CVE-2011-4924 — zope

MEDIUMFix: zopefoundation/Zope@37e4ea7

CVE-2011-4924 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in zope. A fix is available for zope — see the affected versions and patch details below.

Zope XSS Vulnerability

Also known asPYSEC-2026-3440PYSEC-2026-766

Published

Apr 22, 2022

Updated

Jul 13, 2026

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk

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

3 pkgs affected

🐍zope🐍zope2🐍zope2

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

Cross-site scripting (XSS) vulnerability in Zope 2.8.x before 2.8.12, 2.9.x before 2.9.12, 2.10.x before 2.10.11, 2.11.x before 2.11.6, and 2.12.x before 2.12.3, 3.1.1 through 3.4.1. allows remote attackers to inject arbitrary web script or HTML via vectors related to the way error messages perform sanitization. NOTE: this issue exists because of an incomplete fix for CVE-2010-1104

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`zope`	≥ 3.1.1&&< 3.7.3	3.7.3`pip install --upgrade 'zope==3.7.3'`
🐍PyPI	`zope2`	all versions	2.12.22`pip install --upgrade 'zope2==2.12.22'`
🐍PyPI	`zope2`	≥ 2.13.0a1&&< 2.13.12	2.13.12`pip install --upgrade 'zope2==2.13.12'`

Affected Products

1 product · 6 configurations

Application

zopezope

≥ 3.1.1 && ≤ 3.4.1

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zope, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update zope to 3.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2011-4924 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2011-4924 in your dependencies?

Find it across PyPI, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

Zope

7.5/10

Code-Review2/10

Maintained10/10

Branch-Protection8/10

Assessed Oct 19, 2026

Timeline

Disclosed

Apr 22, 2022

Last updated

Jul 13, 2026

Identifiers

CVE-2011-4924

PYSEC-2026-3440

PYSEC-2026-766

References

Advisorynvd.nist.gov · CVE 2011 4924 Webgithub.com · 37e4ea774acc668f6b430a45a6ab1e359710f590 Webgithub.com · a0655194cb39ad88ce3323a3e489927c5f979c44 Webaccess.redhat.com · cve 2011 4924 Webbugzilla.redhat.com · show bug.cgi Websecurity-tracker.debian.org · CVE 2011 4924 Webopenwall.com Webopenwall.com Webopenwall.com Webopenwall.com Packagegithub.com · Zope

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting zope are rated as high or higher (top: high).

CVE-2000-0483CVE-2002-0688CVE-2000-1212CVE-2000-0725CVE-2002-0170CVE-2000-1211CVE-2002-0687CVE-2000-0062

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 13, 2026