XSS in Frappe
CVE-2026-3837
An authenticated attacker can persist crafted values in multiple field types and trigger client-side script execution when another user opens the affected document in Desk. The vulnerable formatter implementations interpolate stored values into raw HTML attributes and element content without escaping This issue affects Frappe: 16.10.0.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Frappe — versions 16.10.0
Weakness classification (CWE)
References
- fluidattacks.com/es/advisories/sabina (Exploit, Third Party Advisory, third-party-advisory)
- github.com/frappe/frappe (Product, product)
- github.com/frappe/frappe/pull/38796 (Patch, patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-3837?
- CVE-2026-3837 is a medium-severity vulnerability in Frappe, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-22.
- How severe is CVE-2026-3837?
- Medium severity. CVSS v3 base score is 5.4 out of 10.