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CVE Record

CVE-2018-18499: A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv=...

A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page 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 Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This was a browser privacy/security bug in older Mozilla products. A malicious page could use a meta refresh redirect and browser performance data to learn cross-origin URL entries that should have been hidden by same-origin policy. The concern is leakage of browsing or navigation information, not server takeover.

Executive priority

Treat as a legacy software hygiene issue unless vulnerable Mozilla versions remain in production. Prioritize remediation for endpoints handling sensitive browsing, email, or regulated workflows, because the impact is cross-origin information disclosure.

Technical view

CVE-2018-18499 is a same-origin policy violation involving meta http-equiv="refresh" redirection and performance.getEntries(), exposing cross-origin URL entries. Affected products are Firefox before 62, Firefox ESR before 60.2, and Thunderbird before 60.2.1. The bundle provides no CVSS, CWE, exploit code, or detailed patch mechanics.

Likely exposure

Likely exposure is limited to organizations still running Firefox below 62, Firefox ESR below 60.2, or Thunderbird below 60.2.1. Modern managed browser fleets should have low exposure if standard update controls are working.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. The described attack requires a user context where vulnerable Mozilla software processes web content and exposes cross-origin URL entries through the affected browser behavior.

Researcher notes

Evidence is source-limited. The key behavior is same-origin policy bypass through refresh-driven redirection and performance entry exposure. No CVSS, CWE, public exploit status, or operational detection indicators are provided in the bundle.

Mitigation direction

  • Upgrade Firefox to version 62 or later.
  • Upgrade Firefox ESR to version 60.2 or later.
  • Upgrade Thunderbird to version 60.2.1 or later.
  • Check Mozilla advisories for environment-specific guidance.
  • Remove unsupported legacy Mozilla builds from managed endpoints.

Validation and detection

  • Inventory endpoint browser and Thunderbird versions.
  • Confirm no Firefox installations are below version 62.
  • Confirm no Firefox ESR installations are below version 60.2.
  • Confirm no Thunderbird installations are below version 60.2.1.
  • Review vulnerability scanner findings against the fixed-version thresholds.
Prepared
Confidence
medium
Sources
6

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

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CVE-2018-18499 mapping review

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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
5Source 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
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.