CVE-2016-2816

MEDIUMNVD 6.56.5—

6.5

Mozilla Firefox before 46.0 allows remote attackers to bypass the Content Security Policy (CSP) protection mechanism via the multipart/x-mixed-replace content type.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 48.1%
KEV: Not listed

Published

April 30, 2016

Last Modified

May 6, 2026

References (18)

security@mozillahttp://lists.opensuse.org/opensuse-security-announce/2016-05/msg00005.html
security@mozillahttp://lists.opensuse.org/opensuse-updates/2016-05/msg00038.html
security@mozillahttp://www.mozilla.org/security/announce/2016/mfsa2016-45.html
security@mozillahttp://www.securitytracker.com/id/1035692
security@mozillahttp://www.ubuntu.com/usn/USN-2936-1
security@mozillahttp://www.ubuntu.com/usn/USN-2936-2
security@mozillahttp://www.ubuntu.com/usn/USN-2936-3
security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1223743
security@mozillahttps://security.gentoo.org/glsa/201701-15
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00005.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-updates/2016-05/msg00038.html
af854a3a-2127-422b-91ae-364da2661108http://www.mozilla.org/security/announce/2016/mfsa2016-45.html
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1035692
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2936-1
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2936-2

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	firefox-testsuite (46.0+build5-0ubuntu0.16.04.2) @ xenial	2026-05-22	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-2936-1MEDIUM
Firefox vulnerabilities

Data Freshness Timeline

(refreshed 9× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:10 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-2816?

CVE-2016-2816 is a medium vulnerability published on April 30, 2016. Mozilla Firefox before 46.0 allows remote attackers to bypass the Content Security Policy (CSP) protection mechanism via the multipart/x-mixed-replace content type.

When was CVE-2016-2816 disclosed?

CVE-2016-2816 was first published in the National Vulnerability Database on April 30, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-2816 actively exploited?

CVE-2016-2816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2016-2816?

CVE-2016-2816 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2016-2816?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2816, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2016-2816

Explore →

Is Your Infrastructure Affected by CVE-2016-2816?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs