What is the CVSS score of CVE-2021-42193?

CVE-2021-42193 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2021-42193?

Yes, a public proof-of-concept exploit is available for CVE-2021-42193. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-42193?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Nopcommerce CVE-2021-42193

EUVD-2021-29175 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-10-03 cve@mitre.org

XSS Nopcommerce

6.1

CVSS 3.1 · Vendor: mitre

View

Vulnerability Assessment

Weakness	CWE CWE-79 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Output encoding, context-aware escaping MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	Attackers can steal session cookies, redirect users to malicious sites, deface content, or perform actions on behalf of authenticated users. With a CVSS score of 6.1 (MEDIUM), this represents a moderate risk.
Exploit ScenarioDerived	An attacker injects a JavaScript payload into a vulnerable input field. When another user views the page, the script executes in their browser, stealing their session token.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 13, 2026

nopCommerce 4.40.3 is vulnerable to XSS in the Product Name at /Admin/Product/Edit/[id]. Each time a user views the product in the shop, the XSS payload fires.

Earlier versions of this analysis (1)

v1 Mar 13, 2026 - 19:29 CVSS 6.1

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

Affected VersionsENISA

n/a n/a

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

Know when Nopcommerce gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (mitre) PRIMARY 6.1 MEDIUM

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

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

PoC Detected

Dec 19, 2025 - 17:07 vuln.today

Public exploit code

CVE Published

Oct 03, 2025 - 17:15 nvd

MEDIUM 6.1

Executive ViewAI

Why It Matters

Organizations using nopCommerce 4.40.3 should be aware of moderate risk from CVE-2021-42193, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.

Threat Intelligence Overview

EPSS Score

0.0%

Top 91% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +30

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

More in Nopcommerce

View all

CVE-2019-19683 CRITICAL Act Now POC

9.1 Dec 09

RoxyFileman, as shipped with nopCommerce v4.2.0, is vulnerable to ../ path traversal via d or f to Admin/RoxyFileman/Pro

CVE-2019-19685 HIGH This Week POC

8.8 Dec 09

RoxyFileman, as shipped with nopCommerce v4.2.0, is vulnerable to CSRF because GET requests can be used for renames and

CVE-2019-19684 HIGH This Week POC

8.8 Dec 09

nopCommerce v4.2.0 allows privilege escalation via file upload in Presentation/Nop.Web/Admin/Areas/Controllers/PluginCon

CVE-2025-11699 HIGH This Week POC

7.1 Dec 01

nopCommerce v4.70 and prior, and version 4.80.3, does not invalidate session cookies after logout or session termination

CVE-2022-27461 MEDIUM This Month POC

6.1 May 04

In nopCommerce 4.50.1, an open redirect vulnerability can be triggered by luring a user to authenticate to a nopCommerce

CVE-2024-38963 MEDIUM This Month POC

6.1 Jul 09

Nopcommerce 4.70.1 is vulnerable to Cross Site Scripting (XSS) via the combined "AddProductReview.Title" and "AddProduct

CVE-2022-26954 MEDIUM This Month POC

6.1 Oct 20

Multiple open redirect vulnerabilities in NopCommerce 4.10 through 4.50.1 allow remote attackers to conduct phishing att

CVE-2022-28449 MEDIUM This Month POC

6.1 Apr 26

nopCommerce 4.50.1 is vulnerable to Cross Site Scripting (XSS). Rated medium severity (CVSS 6.1), this vulnerability is

CVE-2021-26916 MEDIUM This Month POC

6.1 Feb 08

In nopCommerce 4.30, a Reflected XSS issue in the Discount Coupon component allows remote attackers to inject arbitrary

CVE-2022-28450 MEDIUM This Month POC

5.4 Apr 26

nopCommerce 4.50.1 is vulnerable to Cross Site Scripting (XSS) via the "Text" parameter (forums) when creating a new pos

CVE-2022-28448 MEDIUM This Month POC

5.4 Apr 26

nopCommerce 4.50.1 is vulnerable to Cross Site Scripting (XSS). Rated medium severity (CVSS 5.4), this vulnerability is

CVE-2019-11519 MEDIUM This Month POC

4.9 Apr 25

Libraries/Nop.Services/Localization/LocalizationService.cs in nopCommerce through 4.10 allows XXE via the "Configuration

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all

CVE-2020-3580 MEDIUM POC

6.1

CVE-2013-7389 MEDIUM POC

4.3

CVE-2021-25299 MEDIUM POC

6.1

CVE-2014-2120 MEDIUM

6.1

CVE-2023-40000 HIGH POC

8.3

CVE-2016-8581 MEDIUM POC

6.1

CVE-2013-5223 MEDIUM POC

5.4

CVE-2025-52367 MEDIUM POC

5.4

Same technique XSS

View all

CVE-2017-9248 CRITICAL POC

9.8

CVE-2013-1710 CRITICAL POC

10.0

CVE-2024-52875 HIGH POC

8.8

References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-42193 REF http://nop.com REF http://nopcommerce.com

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back