VulnSocial

CVE-2026-4700Disclosure(mozilla / firefox)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

mozilla CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-288CWE-444

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

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

  • Patch or workaround signal is available
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 2 mentions (2026-03-24); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-03-24: 2Mentions · 2026-04-17: 1Patch / Workaround · 2026-04-17: 1Technical Details · 2026-03-24: 2Technical Details · 2026-04-17: 103-2404-17
Signal classification2 categories
Disclosure
266.7%
Patch
133.3%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-03-242
Disclosure2
2026-04-171
Patch1
Full discourse3 posts
  • CVE@CVEnew
    Disclosure

    CVE-2026-4700 Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9. https://www.cve.org/CVERecord?id=CVE-2026-4700

    Post summary

    The post announces CVE-2026-4700, a mitigation bypass in Firefox’s HTTP component that affects versions below 149 and ESR below 140.9.

    00010125
    56.8K followersView on X
  • Giuseppe Paternicola@giuseppe_1337
    Patch

    🚨 CRITICAL: CVE-2026-4700 (CVSS 9.8) - Mitigation bypass in Firefox/Thunderbird HTTP component. Network exploitable, no user interaction required. Patch immediately to Firefox 149, ESR 140.9, or Thunderbird 149/140.9. #CVE #PatchNow https://t.co/QUQwLYuryA

    Post summary

    This tweet alerts users to a critical (CVSS 9.8) mitigation bypass in Firefox/Thunderbird’s HTTP component that is network‑exploitable without user interaction, urging immediate patching to the latest versions.

    0000037
    25 followersView on X
  • The Hacker Wire@TheHackerWire
    Disclosure

    🔴 CVE-2026-4700 - Critical Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. https://www.thehackerwire.com/vulnerability/CVE-2026-4700/ https://t.co/ccKiiCeDT1

    Post summary

    The post announces a new critical vulnerability (CVE-2026-4700) that bypasses mitigation in Firefox and Thunderbird’s HTTP component, affecting versions below 149 and 140.9. No exploit, patch, or active exploitation details are provided.

    0000057
    145 followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---

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