CVE-2026-37503: Cross-Site Scripting (XSS) in V2Board thru 1.7.4

Q: How do I fix CVE-2026-37503?

v2board: upgrade to newer than 1.7.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-37503 being exploited?

CVE-2026-37503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-37503 affect?

CVE-2026-37503 affects v2board. Severity is medium (CVSS 6.9). 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 saveThemeC

Q: How urgent is CVE-2026-37503?

Priority 31/100. Public exploit reference

Routine

MEDIUM 6.9UPGRADE

CVE-2026-37503 is a medium-severity flaw (CVSS 6.9) affecting v2board. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: v2board

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 16:16 UTCPublished CVE record published
2026-06-17 10:41 UTCUpdated Record last modified

v2board v2board UPGRADE

Affected: <= 1.7.4

Fixed in: newer than 1.7.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy v2board || rpm -q v2board || v2board --version

2. UPGRADE to newer than 1.7.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade v2board

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade v2board

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-37503?

v2board: upgrade to newer than 1.7.4. Exact commands for each OS are on this page.

Is CVE-2026-37503 being exploited?

CVE-2026-37503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-37503 affect?

CVE-2026-37503 affects v2board. Severity is medium (CVSS 6.9). 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 saveThemeC

How urgent is CVE-2026-37503?

Priority 31/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-37505 MEDIUM 4.9 UPGRADE SQL Injection via ORDER BY clause in V2Board thru 1.7.4
CVE-2026-37504 MEDIUM 5.3 UPGRADE Sensitive server_token exposed via GET parameter in V2Board thru 1.7.4

References

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