jodit: Prototype pollution in Jodit via Jodit.modules.Helpers.set()

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-55886: 0.53% estimated exploitation activity in the next 30 days; percentile 45.12 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Jodit.modules.Helpers.set(chain, value, obj) walks the dot-separated chain, creating and following each path segment, without filtering prototype-mutating keys. A chain that begins with (or contains) proto, constructor, or prototype lets the final assignment reach and mutate Object.prototype (prototype pollution). Affected - Package: jodit (npm) - Versions: < 4.12.26 - Public API: Jodit.modules.Helpers.set(chain, value, obj) Proof of Concept Impact Applications that pass a user-controlled or partially user-controlled key path into Jodit.modules.Helpers.set() could be vulnerable to prototype pollution (CWE-1321): unexpected property injection, logic bypass, denial of service, or secondary security issues. Patch Fixed in 4.12.26 by rejecting any chain whose segments include proto, constructor, or prototype, reusing the same guard introduced for Jodit.configure() in 4.12.18. Credit Responsibly reported by Junming Wu.

Published by the source

18 Jun 2026, 13:05 UTC

Last modified by the source

31 Jul 2026, 14:45 UTC

Source last checked

26 Oct 2026, 13:00 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vpmm-x3fm-qr5c

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-vpmm-x3fm-qr5c

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# Patch Next advisory brief: CVE-2026-55886

Advisory: jodit: Prototype pollution in Jodit via Jodit.modules.Helpers.set()
IDs: CVE-2026-55886, GHSA-vpmm-x3fm-qr5c
Record: https://patchnext.com/advisories/cve-2026-55886 (revision 3, source checked 26 Oct 2026, 13:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: jodit 4.12.26. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm jodit: affected < 4.12.26; fixed in 4.12.26

## Suggested inspection (read-only)
- `npm ls jodit --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on jodit.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vpmm-x3fm-qr5c (OSV record GHSA-vpmm-x3fm-qr5c lists affected ranges: npm jodit >=0 <4.12.26 (fixed))
- Verified: https://github.com/advisories/GHSA-vpmm-x3fm-qr5c (GitHub-reviewed advisory GHSA-vpmm-x3fm-qr5c lists affected ranges: npm jodit >=0 <4.12.26)

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