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Vulnerability record · CVE-2021-42650 · published 18 October 2021

CVE-2021-42650: Portainer cross-site scripting vulnerability

Portainer · Portainer

Cross Site Scripting (XSS vulnerability exists in Portainer before 2.9.1 via the node input box in Custom Templates.

6.1 CVSS 3.1 Medium EPSS 0.63% · top 51.7% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Cross Site Scripting (XSS vulnerability exists in Portainer before 2.9.1 via the node input box in Custom Templates.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/portainer/portainer/pull/5766 PatchThird Party Advisory
https://github.com/purple-WL/Security-vulnerability/blob/main/Portainer%20Custom%20Templates%20xss Third Party Advisory
https://github.com/portainer/portainer/pull/5766 PatchThird Party Advisory
https://github.com/purple-WL/Security-vulnerability/blob/main/Portainer%20Custom%20Templates%20xss Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-42650), CISA KEV, FIRST EPSS (scores of 2026-10-07). This page is refreshed as NVD updates the record.