Low severity · published Apr 21, 2026
CVE-2026-27937
October: Reflected XSS via DataTable Form Widget
3.1
CVSS
0.1%
EPSS
No
On KEV
Description
October is a Content Management System (CMS) and web platform. Prior to 3.7.16 and 4.1.16, a reflected Cross-Site Scripting (XSS) vulnerability was identified in the backend DataTable widget where a query parameter was rendered without proper output escaping. This vulnerability is fixed in 3.7.16 and 4.1.16.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
october · octobercms
>= 4.0.0, < 4.1.16; < 3.7.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27937
github.com
https://github.com/octobercms/october/security/advisories/GHSA-jj38-h5w5-mvpf
More from october
9.1
CVE-2021-32648
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9.8
CVE-2021-3311
An issue was discovered in October through build 471
9.8
CVE-2017-1000197
October CMS build 412 is vulnerable to file path modification in asset move functionality resulting in creating creating malicious files on the server
9.8
CVE-2017-1000196
October CMS build 412 is vulnerable to PHP code execution in the asset manager functionality resulting in site compromise and possibly other applications on the server
9.8
CVE-2017-1000194
October CMS build 412 is vulnerable to Apache configuration modification via file upload functionality resulting in site compromise and possibly other applications on the server