# CVE-2026-3837: Frappe Framework 16.10.0 - Stored DOM XSS in Multiple Field Formatters

> Authenticated attackers can inject malicious scripts via field formatters, leading to client-side code execution when other users view documents.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Apr 2026
- **Updated:** 27 Apr 2026
- **Also known as:** GHSA-fgxh-7qw6-7wg3

## What is CVE-2026-3837?

CVE-2026-3837 is a medium-severity cross-site scripting vulnerability in Frappe, published on 22 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-3837?

It affects 1 product.


Products: Frappe Frappe.

## How do I fix CVE-2026-3837?

No fix has been published for CVE-2026-3837 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3837 being exploited?

There is no known exploitation of CVE-2026-3837 in the wild and no public exploit code.

## Other vulnerabilities in Frappe

- [CVE-2019-14965](https://insights.sbomify.com/CVE-2019-14965/): Code injection in n/a (critical 9.8)
- [CVE-2026-35614](https://insights.sbomify.com/CVE-2026-35614/): Frappe has a SQL injection in bulk_update (critical 9.3)
- [CVE-2026-31877](https://insights.sbomify.com/CVE-2026-31877/): Frappe SQL Injection due to improper field sanitization (critical 9.3)
- [CVE-2025-68929](https://insights.sbomify.com/CVE-2025-68929/): Frappe may be vulnerable remote code execution due to server-side template injection (critical 9.1)
- [CVE-2019-14966](https://insights.sbomify.com/CVE-2019-14966/): SQL injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3837 and fix it if it is affected.

What it is: CVE-2026-3837 is a medium-severity cross-site scripting vulnerability in Frappe, published on 22 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-3837 in the wild and no public exploit code.

Affected product: Frappe. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3837/ (Markdown: https://insights.sbomify.com/CVE-2026-3837/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3837
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3837
- OSV: https://osv.dev/vulnerability/CVE-2026-3837

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3837/
Summaries are generated and may contain mistakes; the official description above is the record.