How severe is CVE-2021-33562?

CVE-2021-33562 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-2021-33562?

CVE-2021-33562 affects the following packages: com.shopizer:shopizer (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-33562?

Update com.shopizer:shopizer to 2.17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33562 is resolved across your whole dependency graph.

How do I detect CVE-2021-33562 in my Maven dependencies?

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

How do I mitigate CVE-2021-33562 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-2021-33562 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2021-33562, including 1 documented proof-of-concept exploit on Exploit-DB and 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-2021-33562?

CVE-2021-33562 has an EPSS (Exploit Prediction Scoring System) score of 2.9%, placing it in the 87th 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-2021-33562?

CVE-2021-33562 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-2021-33562 published, and has it been updated?

CVE-2021-33562 was published on May 24, 2021 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2021-33562 — shopizer

MEDIUMFix: shopizer-ecommerce/shopizer@197f8c7

CVE-2021-33562 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in com.shopizer:shopizer. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for com.shopizer:shopizer — see the affected versions and patch details below.

Cross-site scripting in Shopizer

Also known asGHSA-378p-hrq3-x4p3

Published

May 24, 2021

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

2 known

Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs87th percentile — riskier than 87% 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

☕com.shopizer:shopizer

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

Description

A reflected cross-site scripting (XSS) vulnerability in Shopizer before 2.17.0 allows remote attackers to inject arbitrary web script or HTML via the ref parameter to a page about an arbitrary product, e.g., a product/insert-product-name-here.html/ref= URL.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.shopizer:shopizer`	all versions	2.17.0`com.shopizer:shopizer:2.17.0`

Affected Products

1 product · 1 configurations

Application

shopizershopizer

< 2.17.0

range

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.

EDB-49901webappsjava

Shopizer 2.16.0 - 'Multiple' Cross-Site Scripting (XSS)

by Marek Toth · May 24, 2021

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.shopizer:shopizer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.shopizer:shopizer to 2.17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33562 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-2021-33562 in your dependencies?

Find it across Maven, 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. 2 public proof-of-concept references are listed on this page.

OpenSSF Scorecard

Package health score

shopizer

1.8/10

Code-Review0/10

Maintained0/10

Branch-Protection0/10

Assessed Oct 19, 2026

Timeline

First exploit

May 24, 2021

Disclosed

May 24, 2021

Last updated

Oct 20, 2026

Identifiers

CVE-2021-33562

GHSA-378p-hrq3-x4p3

References

Advisorynvd.nist.gov · CVE 2021 33562 Fixgithub.com · 197f8c78c8f673b957e41ca2c823afc654c19271 Fixgithub.com · 2.16.0...2.17.0 Evidenceexploit-db.com

Related vulnerabilities

Also affects shopizer

This CVE is medium severity; 4 of 4 other CVEs affecting shopizer are rated as high or higher (top: critical).

CVE-2026-36767CVE-2026-36766CVE-2022-23059CVE-2021-33561

Same weakness: CWE-79

This CVE is medium severity; 2 of 4 other CVEs with CWE-79 are rated as high or higher (top: moderate).

CVE-2026-126075CVE-2026-126063CVE-2026-110802CVE-2026-123364Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026

CVE-2021-33562 — shopizer

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-33562 in your dependencies?