CVE-2018-18495: Mozilla Firefox vulnerability

CVE-2018-18495: WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the per...

WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the permissions granted to extensions. This could allow an extension to interfere with the loading and usage of these pages and use capabilities that were intended to be restricted from extensions. This vulnerability affects Firefox < 64.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 11:08 UTC (UTC+00:00)

Security readout for executives and security teams

Firefox versions before 64 allowed WebExtension content scripts to load into some internal about: pages, despite permission boundaries intended to block that behavior. A malicious or unsafe extension could interfere with those pages or use restricted browser capabilities. Exposure is mainly systems running Firefox below version 64, especially where users can install or retain untrusted browser extensions. Modern, supported Firefox deployments should not be affected if fully updated. Treat this as a legacy-browser hygiene issue unless old Firefox versions remain in use. Prioritize remediation for managed endpoints with user-installed extensions or weak browser update controls. Mitigation focus: Upgrade Firefox to version 64 or later, or a supported fixed release.; Apply Firefox updates from Mozilla or the operating-system vendor.; Remove unsupported Firefox versions from managed endpoints..

Prepared: Jun 6, 2026, 21:46 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: Feb 28, 2019, 18:00 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
https://www.mozilla.org/security/advisories/mfsa2018-29/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1427585CVE reference · x_refsource_CONFIRM
USN-3844-1CVE reference · vendor-advisory, x_refsource_UBUNTU

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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