CVE-2015-4518: n/a vulnerability

CVE-2015-4518: The Reader View implementation in Mozilla Firefox before 42.0 has an improper whitelist, which makes it eas...

The Reader View implementation in Mozilla Firefox before 42.0 has an improper whitelist, which makes it easier for remote attackers to bypass the Content Security Policy (CSP) protection mechanism and conduct cross-site scripting (XSS) attacks via vectors involving SVG animations and the about:reader URL.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 06:18 UTC (UTC+00:00)

Security readout for executives and security teams

This old Firefox issue let a malicious page weaken browser Content Security Policy protections through Reader View. If exploited, it could enable cross-site scripting in affected browsing contexts. Business risk is mainly from unmanaged or legacy Firefox installations older than version 42.0. Exposure is likely limited to endpoints still running Mozilla Firefox before 42.0 or downstream Linux/browser packages from that era. Modern supported Firefox deployments are unlikely to be affected. Highest concern is legacy workstations, kiosks, archived VM images, and unmanaged Linux desktops. Treat this as a legacy hygiene issue unless old Firefox deployments are present. It does not justify emergency response without affected assets, but any unsupported browser on user endpoints should be removed or upgraded promptly. Mitigation focus: Upgrade Firefox to version 42.0 or later.; Apply relevant OS vendor browser security updates.; Remove unsupported legacy Firefox builds from managed endpoints..

Prepared: Jun 13, 2026, 21:45 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

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 5, 2015, 02:00 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

4Source 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
GLSA-201512-10CVE reference · vendor-advisory, x_refsource_GENTOO
https://bugzilla.mozilla.org/show_bug.cgi?id=1136692CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1182778CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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