How severe is CVE-2021-41952?

CVE-2021-41952 has a CVSS score of 4.8/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-41952?

CVE-2021-41952 affects the following packages: tribalsystems/zenario (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2021-41952?

Update tribalsystems/zenario to 9.0.55143 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-41952 is resolved across your whole dependency graph.

How do I detect CVE-2021-41952 in my Packagist dependencies?

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

How do I mitigate CVE-2021-41952 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-2021-41952 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2021-41952, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-41952?

CVE-2021-41952 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th 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-2021-41952?

CVE-2021-41952 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-2021-41952 published, and has it been updated?

CVE-2021-41952 was published on March 14, 2022 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2021-41952 — zenario

MEDIUMFix: TribalSystems/Zenario@4566d8a

CVE-2021-41952 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in tribalsystems/zenario. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for tribalsystems/zenario — see the affected versions and patch details below.

Cross-site Scripting in Zenario CMS

Also known asGHSA-x8wj-cqmp-3wmm

Published

Mar 14, 2022

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs44th percentile — riskier than 44% 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

1 pkg affected

🐘tribalsystems/zenario

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Zenario CMS 9.0.54156 is vulnerable to Cross Site Scripting (XSS) via upload file to *.SVG. An attacker can send malicious files to victims and steals victim's cookie leads to account takeover. The person viewing the image of a contact can be victim of XSS.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`tribalsystems/zenario`	all versions	9.0.55143`composer require tribalsystems/zenario:^9.0.55143`

Affected Products

1 product · 1 configurations

Application

zenariotribalsystems

1 version

9.0.54156

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Zenario CMS 9.0.54156 is vulnerable to Cross Site Scripting (XSS) via up…

github.comNVDMar 2022

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tribalsystems/zenario, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update tribalsystems/zenario to 9.0.55143 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-41952 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-2021-41952 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

4.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

Timeline

Disclosed

Mar 14, 2022

First exploit

Mar 21, 2022

7 days after disclosure — rapid exploitation

Last updated

Oct 24, 2026

Identifiers

CVE-2021-41952

GHSA-x8wj-cqmp-3wmm

References

Advisorynvd.nist.gov · CVE 2021 41952 Reportgithub.com Webgithub.com · 4566d8a9ac6755f098b3373252fdb17754a77007 Webgithub.com · 9.0.55141 Packagegithub.com · Zenario

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs affecting tribalsystems/zenario are rated as high or higher (top: critical).

CVE-2024-45964CVE-2024-45960CVE-2024-34460CVE-2024-34461CVE-2023-44769CVE-2023-44771CVE-2023-44770CVE-2022-44136

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026