CVE-2026-37503 json
Cross-Site Scripting (XSS) in V2Board thru 1.7.4.
published 2026-05-01 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-26667
- cvss
- 6.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gist.github.com https://gist.github.com/sgInnora/1330e1a82caa79906eec55eeff2c99b9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.9 | CVSS:3.1/AC:L/AV:N/A:N/C:H/I:L/PR:H/S:C/UI:R |
| CNA | 3.1 | 6.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
gist.github.com
/sgInnora/1330e1a82caa79906eec55eeff2c99b9
exploit, third-party-advisory
-
github.com
/v2board/v2board
product
Sources
- CVE List CVE-2026-37503
- NVD CVE-2026-37503
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.