CVE-2021-31930

6.1 mediumEPSS 0.9%

Medium (6.1) in concerto-signage concerto. EPSS 0.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.1 medium

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

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-05-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

concerto-signage:concerto

References

https://github.com/concerto/concerto/pull/1558
https://github.com/concerto/concerto/security/advisories
https://github.com/concerto/concerto/pull/1558
https://github.com/concerto/concerto/security/advisories

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