CVE-2021-42841

Name: CVE-2021-42841
Creator: NVD / NIST
Published: 2022-01-06T21:15:08.08+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.85%

Last modified Jun 17, 2026

CVE-2021-42841 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Insta HMS before 12.4.10 is vulnerable to XSS because of improper validation of user-supplied input by multiple scripts. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

Description

Insta HMS before 12.4.10 is vulnerable to XSS because of improper validation of user-supplied input by multiple scripts. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.85%

53.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Practo	Insta Hms	< 12.4.10

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/210416Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/210416Third Party Advisory, VDB Entry

Timeline

Published: Jan 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42841?

How severe is CVE-2021-42841?

CVE-2021-42841 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42841?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42841?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST