CVE-2026-37503
CVE-2026-37503 is a medium-severity vulnerability in V2board with a CVSS 3.x base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.9)
- EPSS exploit prediction: 0% (9th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26667
- Weakness: CWE-79
- Affected product: V2board
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-37503?
- 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.
- How severe is CVE-2026-37503?
- CVE-2026-37503 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
- Is CVE-2026-37503 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-37503?
- CVE-2026-37503 affects V2board. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-37503?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-37503 have an EU (EUVD) identifier?
- Yes. CVE-2026-37503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26667.
- When was CVE-2026-37503 published?
- CVE-2026-37503 was published on 2026-05-01 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:v2board:v2board:*:*:*:*:*:*:*:*
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