VulnSocial

CVE-2026-4723Disclosure(mozilla / firefox)

LOWCVSS 9.8 · CRITICAL

Signal is active with 3 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

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

mozilla CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

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

  • firefox

Threat summary

  • 3 mentions across 1 observed day

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • 3 total mentions across 1 day

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-03-24: 3Technical Details · 2026-03-24: 303-24
Signal classification2 categories
Disclosure
266.7%
General
133.3%
Referenced assets3 URLs
Full discourse3 posts
  • The Hacker Wire@TheHackerWire
    Disclosure

    🔴 CVE-2026-4723 - Critical Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Thunderbird < 149. https://www.thehackerwire.com/vulnerability/CVE-2026-4723/ https://t.co/qAjijlAOgt

    Post summary

    Disclosed a use‑after‑free vulnerability in Mozilla's JavaScript engine affecting Firefox and Thunderbird versions below 149; no PoC, exploit, or patch information is provided.

    0000045
    145 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-4723 Use-After-Free Vulnerability in Firefox JavaScript Engine Before Version 149 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-4723

    Post summary

    The text announces CVE-2026-4723 as a use‑after‑free flaw in Mozilla Firefox's JavaScript engine before version 149, providing no exploitation or patch details.

    0000043
    4.0K followersView on X
  • CVE@CVEnew
    General

    CVE-2026-4723 Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149. https://www.cve.org/CVERecord?id=CVE-2026-4723

    Post summary

    A concise announcement of CVE-2026-4723, noting it as a use-after-free in Firefox’s JavaScript engine for versions below 149, without additional details on exploitation or mitigation.

    00000106
    56.8K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---

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