CVE-2026-37503

Name: CVE-2026-37503
Creator: NVD / NIST
Published: 2026-05-01T16:16:30.49+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-37503 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

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

4.8/10

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

EPSS Probability

0.19%

9.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
V2board	V2board	<= 1.7.4

References

https://gist.github.com/sgInnora/1330e1a82caa79906eec55eeff2c99b9Exploit, Third Party Advisory
https://github.com/v2board/v2boardProduct

Timeline

Published: May 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-37503?

How severe is CVE-2026-37503?

CVE-2026-37503 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-37503?

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.

Are you affected by CVE-2026-37503?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST