CVE-2021-27902
MEDIUMCVSS 6.1/10EPSS 0.99%
Last modified
CVE-2021-27902 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.. EPSS estimates a 0.99% chance of exploitation in the next 30 days.
Description
An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Craftcms | Craft Cms | < 3.6.0 |
References
- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26Release Notes, Third Party Advisory
- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1Release Notes, Third Party Advisory
- https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19cePatch, Third Party Advisory
- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26Release Notes, Third Party Advisory
- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1Release Notes, Third Party Advisory
- https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19cePatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27902?
An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.
How severe is CVE-2021-27902?
CVE-2021-27902 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27902?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27902?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST