UpHeron
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Servers and applications

CVE-2021-41252

Cross-site scripting (XSS) from writer field content in the site frontend

Severity
Medium 5.4
Published
16 Nov 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
3.5.8
Also known as
GHSA-x7j7-qp7j-hw3q
Sources
NVD, Project advisories (GitHub)

Description

Kirby is an open source file structured CMS ### Impact Kirby's writer field stores its formatted content as HTML code. Unlike with other field types, it is not possible to escape HTML special characters against cross-site scripting (XSS) attacks, otherwise the formatting would be lost. If the user is logged in to the Panel, a harmful script can for example trigger requests to Kirby's API with…

Affected software

SoftwareAffected versions
KirbyServers and applications · cpe:a:getkirby:kirby
  • From 3.5.0 up to 3.5.7.1
KirbyServers and applications · github:getkirby/kirby
  • From 3.5.0 before 3.5.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-41252
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-41252
  • GitHub Advisory Database https://github.com/advisories/GHSA-x7j7-qp7j-hw3q
  • github.com https://github.com/getkirby/kirby/security/advisories/GHSA-x7j7-qp7j-hw3q