CVE-2021-27902

Cross Site Scripting in CraftCMS

Reported a stored cross-site scripting vulnerability in CraftCMS that was assigned CVE-2021-27902. The issue arose from an unrestricted file upload feature, where HTML files were allowed by default.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-27902
• https://eval.blog/research/craftcms-zero-day-ssti-xss-triggering-rce
• https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19ce