VulnSocial

CVE-2026-4687Disclosure(mozilla / firefox)

LOWCVSS 8.6 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

mozilla CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-754CWE-120CWE-501

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • firefox

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-03-24); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-03-24: 1Mentions · 2026-03-25: 1Technical Details · 2026-03-24: 1Technical Details · 2026-03-25: 103-2403-25
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • The Hacker Wire@TheHackerWire
    Disclosure

    🟠 CVE-2026-4687 - High Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 1... https://www.thehackerwire.com/vulnerability/CVE-2026-4687/ https://t.co/3SNF6LDrqs

    Post summary

    The post announces a newly disclosed CVE-2026-4687, describing a sandbox escape vulnerability affecting certain Firefox and Thunderbird versions.

    0000057
    145 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-4687 Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. https://www.cve.org/CVERecord?id=CVE-2026-4687

    Post summary

    A new sandbox escape vulnerability (CVE-2026-4687) affecting Firefox versions below 149 and certain ESR releases is disclosed.

    00000140
    56.8K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---

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