CVE-2018-18497: Mozilla Firefox vulnerability

CVE-2018-18497: Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a p...

Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the URL field is used within the extension to load multiple pages as a single argument. This could allow a malicious WebExtension to open privileged about: or file: locations. 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

CVE-2018-18497 is a Firefox WebExtension bypass. A malicious browser extension could get around restrictions on what pages it may open and launch privileged internal or local file locations. The business risk is mainly from old Firefox installations and untrusted extensions, not from direct server-side exposure. Exposure is likely limited to endpoints running Firefox versions earlier than 64, including older Ubuntu-packaged Firefox builds, where users can install or run malicious WebExtensions. Modern supported Firefox deployments are unlikely to be affected if fully patched. Treat this as a patch hygiene and endpoint extension-control issue. It is not KEV-listed in the provided data, but any remaining Firefox pre-64 deployments are far out of date and should be remediated quickly. Mitigation focus: Upgrade Firefox to version 64 or later, or a current supported vendor build.; Apply Ubuntu security updates referenced by USN-3844-1 where applicable.; Remove untrusted, unnecessary, or abandoned Firefox extensions 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

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-2018-18497 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: 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://bugzilla.mozilla.org/show_bug.cgi?id=1488180CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2018-29/CVE 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

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