LiveActive security incident?Get immediate response
CVE Record

CVE-2018-18494: A same-origin policy violation allowing the theft of cross-origin URL entries when using the Javascript loc...

A same-origin policy violation allowing the theft of cross-origin URL entries when using the Javascript location property to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Mozilla browser issue could let a malicious page learn cross-origin URL entries that should have stayed private. The listed affected products are Firefox before 64, Firefox ESR before 60.4, and Thunderbird before 60.4. The source bundle does not provide CVSS scoring or evidence of active exploitation.

Executive priority

Prioritize remediation where old Mozilla clients remain in business use. This is not KEV-listed in the supplied data, but it concerns browser same-origin protections and potential data theft, so stale desktop software should be cleaned up during normal vulnerability maintenance.

Technical view

CVE-2018-18494 is a same-origin policy violation involving JavaScript location redirection and performance.getEntries(). It could expose cross-origin URL entries, creating a data-theft risk. Mozilla and Linux distribution advisories reference fixed package releases, but the provided evidence does not include exploit details, CVSS metrics, or KEV listing.

Likely exposure

Exposure is mainly legacy Mozilla client software: Firefox < 64, Firefox ESR < 60.4, and Thunderbird < 60.4. Organizations with unmanaged desktops, old Linux distributions, VDI images, or archived application stacks are the most plausible remaining exposure points.

Exploitation context

The bundle describes a web-origin privacy bypass, but provides no evidence of active exploitation and marks KEV as false. Treat exploitation status as unconfirmed. A realistic concern is user-driven browsing or email-rendering exposure on outdated Mozilla software.

Researcher notes

The evidence supports affected product and version boundaries plus the vulnerability class. It does not support claims about public exploit availability, observed exploitation, or detailed attack mechanics. Validation should focus on software version inventory and vendor advisory alignment, not exploit reproduction.

Mitigation direction

  • Upgrade Firefox to version 64 or later.
  • Upgrade Firefox ESR to version 60.4 or later.
  • Upgrade Thunderbird to version 60.4 or later.
  • Apply relevant Debian, Ubuntu, Red Hat, or Gentoo security updates.
  • Check Mozilla and OS vendor advisories for environment-specific package guidance.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions.
  • Identify systems running versions older than the fixed releases.
  • Check Linux package advisory status against distribution security notices.
  • Confirm endpoint management reports successful browser and mail-client updates.
  • Document any unsupported legacy systems requiring compensating controls.
Prepared
Confidence
medium
Sources
12

Public sources used

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-2018-18494 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
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
15Source links

CVSS and timeline data

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaThunderbirdunspecifiedListed
MozillaFirefox ESRunspecifiedListed
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.