CVE-2026-37503 PUBLISHED

Assigner: mitre
Reserved: 06.04.2026 Published: 01.05.2026 Updated: 01.05.2026

Cross-Site Scripting (XSS) in V2Board thru 1.7.4. The custom_html field in theme configuration is rendered using Blade unescaped output in public/theme/v2board/dashboard.blade.php. An admin can inject arbitrary JavaScript via the saveThemeConfig API. All site visitors execute the payload, enabling cookie theft, session hijacking, or phishing.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AC:L/AV:N/A:N/C:H/I:L/PR:H/S:C/UI:R
CVSS Score: 6.9

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	Low
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	n/a
Product	n/a
Versions	Version n/a is affected

References

https://github.com/v2board/v2board
https://gist.github.com/sgInnora/1330e1a82caa79906eec55eeff2c99b9

Problem Types

n/a text