CVE-2016-9895: Mozilla Firefox vulnerability

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

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 03:07 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw let certain obsolete Mozilla clients run JavaScript that a strict Content Security Policy was supposed to block. The business risk is mainly legacy exposure: users on old Firefox, Firefox ESR, or Thunderbird versions could lose a browser-side defense against script injection. Exposure is limited to environments still running Firefox < 50.1, Firefox ESR < 45.6, or Thunderbird < 45.6. Web applications depending on strict CSP for XSS containment face higher impact when accessed through those clients. Treat as a legacy-client hygiene issue unless old Mozilla clients are still present. Prioritize remediation in managed fleets, kiosks, VDI images, and mail-reader environments where unsupported software may persist. Mitigation focus: Upgrade Firefox to 50.1 or later where legacy deployments remain.; Upgrade Firefox ESR to 45.6 or later.; Upgrade Thunderbird to 45.6 or later..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2016-9895 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.mozilla.org/security/advisories/mfsa2016-94/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-95/CVE reference · x_refsource_CONFIRM
GLSA-201701-15CVE reference · vendor-advisory, x_refsource_GENTOO
DSA-3757CVE reference · vendor-advisory, x_refsource_DEBIAN
https://bugzilla.mozilla.org/show_bug.cgi?id=1312272CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-96/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

MozillaFirefox ESRunspecifiedListed

MozillaThunderbirdunspecifiedListed

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.