CVE-2021-31930

Name: CVE-2021-31930
Creator: NVD / NIST
Published: 2021-05-19T15:15:08.85+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.92%

Last modified Jun 17, 2026

CVE-2021-31930 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Persistent cross-site scripting (XSS) in the web interface of Concerto through 2.3.6 allows an unauthenticated remote attacker to introduce arbitrary JavaScript by injecting an XSS payload into the First Name or Last Name parameter upon registration. When a privileged user attempts to delete the account, the XSS payload will be executed.. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

Persistent cross-site scripting (XSS) in the web interface of Concerto through 2.3.6 allows an unauthenticated remote attacker to introduce arbitrary JavaScript by injecting an XSS payload into the First Name or Last Name parameter upon registration. When a privileged user attempts to delete the account, the XSS payload will be executed.

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

0.92%

55.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Concerto-Signage	Concerto	<= 2.3.6

References

https://github.com/concerto/concerto/pull/1558Third Party Advisory
https://github.com/concerto/concerto/security/advisoriesThird Party Advisory
https://github.com/concerto/concerto/pull/1558Third Party Advisory
https://github.com/concerto/concerto/security/advisoriesThird Party Advisory

Timeline

Published: May 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31930?

How severe is CVE-2021-31930?

CVE-2021-31930 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31930?

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-2021-31930?

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

Scan your code now

Source: NVD / NIST