Clipboard-based XSS

Exploitation

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

CVSS

8.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS

• CVE-2021-41086: 0.91% estimated exploitation activity in the next 30 days; percentile 60.17 (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.

Impact XSS against the user. Details jsuites is vulnerable to DOM based XSS if the user can be tricked into copying anything from a malicious and pasting it into the html editor. This is because a part of the clipboard content is directly written to innerHTML causing XSS. References The Curious Case of Copy & Paste – on risks of pasting arbitrary content in browsers: https://research.securitum.com/the-curious-case-of-copy-paste/

Published by the source

22 Sep 2021, 20:39 UTC

Last modified by the source

8 Jul 2026, 06:28 UTC

Source last checked

26 Oct 2026, 12:21 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-qh7x-j4v8-qw5w

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-qh7x-j4v8-qw5w

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-41086

Advisory: Clipboard-based XSS
IDs: CVE-2021-41086, GHSA-qh7x-j4v8-qw5w
Record: https://patchnext.com/advisories/cve-2021-41086 (revision 2, source checked 26 Oct 2026, 12:21 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: jsuites 4.9.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm jsuites: affected < 4.9.11; fixed in 4.9.11

## Suggested inspection (read-only)
- `npm ls jsuites --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 jsuites.
- 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-qh7x-j4v8-qw5w (OSV record GHSA-qh7x-j4v8-qw5w lists affected ranges: npm jsuites >=0 <4.9.11 (fixed))
- Verified: https://github.com/advisories/GHSA-qh7x-j4v8-qw5w (GitHub-reviewed advisory GHSA-qh7x-j4v8-qw5w lists affected ranges: npm jsuites >=0 <4.9.11)

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