VulnSocial

CVE-2026-2780Disclosure(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

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

mozilla CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-269

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
  • thunderbird

Threat summary

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

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 4 signals
  • Disclosure: 3 classified signals
  • Peaked 2d ago at 2 mentions (2026-02-25); latest day: 1
  • 4 total mentions across 3 days

Affected systems

Vendors
mozilla
Products
firefoxthunderbird

Deep dive

Activity timeline4 mentions / 3d
01122Mentions · 2026-02-25: 2Mentions · 2026-03-01: 1Mentions · 2026-04-16: 1Patch / Workaround · 2026-04-16: 1Technical Details · 2026-02-25: 2Technical Details · 2026-03-01: 1Technical Details · 2026-04-16: 102-2503-0104-16
Signal classification2 categories
Disclosure
375.0%
Patch
125.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-02-252
Disclosure2
2026-03-011
Disclosure1
2026-04-161
Patch1
Full discourse4 posts
  • Giuseppe Paternicola@giuseppe_1337
    Patch

    🚨 CRITICAL: CVE-2026-2780 (CVSS 9.8) - Privilege escalation in Firefox/Thunderbird Netmonitor component. Network exploitable, no user interaction required. Patched in Firefox 148, ESR 140.8, Thunderbird 148/140.8. Update immediately. #CVE #PatchNow https://t.co/BSqvv9GYns

    Post summary

    The tweet announces a critical privilege‑escalation CVE affecting Firefox/Thunderbird, includes patch version details, and urges users to update immediately.

    0000050
    25 followersView on X
  • CRAC Learning - Tech@cracbot
    Disclosure

    CVE-2026-2780 (CVSS:9.8, CRITICAL) is Modified. Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunder..https://nvd.nist.gov/vuln/detail/CVE-2026-2780 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre

    Post summary

    The post announces a critical privilege escalation vulnerability in Firefox’s Netmonitor component, providing CVSS score and affected versions, but offers no PoC, exploit, or patch details.

    0000032
    173 followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-2780 Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2780 ----- Traducción: CVE-2026-2780 Escalación de privilegios en el componente Netmonitor. Est… http://infoflow.cloud`

    Post summary

    A new privilege escalation vulnerability (CVE-2026-2780) affecting older Firefox versions has been disclosed, detailing the affected component and version ranges.

    0000042
    54 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-2780 Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2780

    Post summary

    A privilege escalation vulnerability (CVE-2026-2780) in Firefox’s Netmonitor component affects versions below 148 and ESR below 140.8.

    00000217
    56.6K followersView on X
CPE platform detail4 entries

4 of 4 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---
Appmozillathunderbird---
Appmozillathunderbird---

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