VulnSocial

CVE-2026-75874Disclosure(mozilla / firefox)

LOWCVSS 10.0 · 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

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-693

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

What's happening

  • Patch or workaround mentioned in 2 signals
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • Peaked 1d ago at 2 mentions (2026-08-19); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
mozilla
Products
firefoxthunderbird

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-08-19: 2Mentions · 2026-08-20: 1Patch / Workaround · 2026-08-19: 1Patch / Workaround · 2026-08-20: 1Technical Details · 2026-08-19: 1Technical Details · 2026-08-20: 108-1908-20
Signal classification3 categories
Disclosure
133.3%
General
133.3%
Patch
133.3%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-08-192
Disclosure1General1
2026-08-201
Patch1
Full discourse3 posts
  • CVE Brief@DailyCVEBrief
    Disclosure

    DEEP DIVE — CVE-2026-75874: sandbox escape in the Remote Settings client of Firefox and Thunderbird, fixed in 154. Feeds carry CVSS 10.0; Mozilla rates it high and the bug report is still restricted. Quick check: open about:support and read the Version row. https://t.co/NkcTQLALaD

    Post summary

    The tweet details CVE‑2026‑75874—a sandbox escape in Firefox/Thunderbird’s Remote Settings client with a CVSS of 10.0, patched in version 154, but the bug report remains restricted.

    1000052
    29 followersView on X
  • SecAlerts@SecAlertsCo
    Patch

    🦊 Firefox & Thunderbird users: update to v154 now. CVE-2026-75874 is a CVSS 10 sandbox escape via the Remote Settings Client — network-exploitable, no auth, no interaction needed. #cybersecurity #ciso #cto #vulnerabilities #msp https://secalerts.co/vulnerability/CVE-2026-75874?utm_campaign=x https://t.co/qhpUhchkw3

    Post summary

    The tweet warns of CVE‑2026‑75874, a CVSS 10 sandbox escape affecting Firefox and Thunderbird, and urges users to update to version 154 to mitigate the risk.

    0000081
    878 followersView on X
  • CVE Brief@DailyCVEBrief
    General

    Full Deep Dive — am-I-vulnerable check, threat model, starter YARA + Sigma rules: https://cvebrief.com/cve/CVE-2026-75874/ https://t.co/0NZ6LkUxeh

    Post summary

    The tweet announces a deep dive into CVE‑2026‑75874, offering threat modeling and YARA/Sigma rule templates, but provides no concrete technical or exploit information.

    0000029
    29 followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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