CVE-2021-41258

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Summary

CVECVE-2021-41258
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-11-16 18:15:00 UTC
Updated2021-11-18 17:27:00 UTC
DescriptionKirby is an open source file structured CMS. In affected versions Kirby's blocks field stores structured data for each block. This data is then used in block snippets to convert the blocks to HTML for use in your templates. We recommend to escape HTML special characters to protect against cross-site scripting (XSS) attacks. The default snippet for the image block unfortunately did not use our escaping helper. This made it possible to include malicious HTML code in the source, alt and link fields of the image block, which would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site. Attackers must be in your group of authenticated Panel users in order to exploit this weakness. Users who do not make use of the blocks field are not affected. This issue has been patched in Kirby version 3.5.8 by escaping special HTML characters in the output from the default image block snippet. Please update to this or a later version to fix the vulnerability.

Risk And Classification

Problem Types: CWE-79

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getkirby Kirby All All All All

References

ReferenceSourceLinkTags
Release 3.5.8 · getkirby/kirby · GitHub MISC github.com
Cross-site scripting (XSS) from image block content in the site frontend · Advisory · getkirby/kirby · GitHub CONFIRM github.com
Escape output in image block default snippet by lukasbestle · Pull Request #3510 · getkirby/kirby · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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