CVE-2021-27902
Craft CMS Cross-site Scripting Vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-27902- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-27902- Updated
- 2026-11-02
EUVDEUVD-2021-1437 No score
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.
- Record
EUVD-2021-1437- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3jxh-789f-p7m6
Craft CMS Cross-site Scripting Vulnerability
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.
- Record
GHSA-3jxh-789f-p7m6- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-27902- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-3jxh-789f-p7m6
Craft CMS Cross-site Scripting Vulnerability
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.
- Record
GHSA-3jxh-789f-p7m6- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
craftcms/cmsPackagist |
before 3.6.0 | 3.6.0 |
craftcms/cmsPackagist |
before 3.6.0, plus listed versions 1.0.26.11.2.0-alpha.23101.2.0-alpha.23121.2.0-alpha.23161.2.0-alpha.2318 Show 45 moreShow less1.2.0-alpha.23191.2.0-alpha.23221.2.0-alpha.23231.2.0-alpha.23241.2.0-alpha.23281.2.0-alpha.23291.2.0-alpha.23321.2.23331.2.23351.2.23361.2.23371.2.23391.2.23581.2.23631.2.23671.2.23711.2.23751.2.23871.2.23921.2.23961.2.23991.3.0-alpha.23611.3.0-alpha.23661.3.0-alpha.23721.3.0-alpha.23741.3.0-alpha.23771.3.0-alpha.23781.3.0-alpha.23801.3.0-alpha.23881.3.0-alpha.23941.3.0-alpha.23971.3.0-alpha.24011.3.0-alpha.24021.3.0-alpha.24051.3.0-alpha.24641.3.24091.3.24101.3.24151.3.24161.3.24181.3.24191.3.24201.3.24221.3.24561.3.2459 |
3.6.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27902 is a medium vulnerability (CVSS 6.1) in Craftcms Craft Cms, published June 30, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.99%, the 62nd percentile. Fixed in craftcms/cms 3.6.0.
References
Left out here: 626 versions. The JSON record has them.