VulnSocial

CVE-2026-8401Patch(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

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

mozilla CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-693CWE-653

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

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-05-12); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-12: 1Mentions · 2026-05-13: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-12: 1Technical Details · 2026-05-13: 105-1205-13
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Referenced assets9 URLs
Classification over time
DateTotalLabels
2026-05-121
Patch1
2026-05-131
Disclosure1
Full discourse2 posts
  • xvonfers@xvonfers
    Disclosure

    (CVE-2026-8388)[2036978]Incorrect boundary conditions in JIT https://hg-edge.mozilla.org/mozilla-central/rev/f5e01e65b75a28326c9cb3c858f803b2fb6d828a (CVE-2026-8389)[2036983]JIT miscompilation https://hg-edge.mozilla.org/mozilla-central/rev/f40113af5ca58bb949fe7c19f58b82ff1723b343 (CVE-2026-8401)[2038679]SBX escape in the Profile Backup https://hg-edge.mozilla.org/mozilla-central/rev/ef49b255ce2a13b89743a1daf85526323a5d38ee https://www.mozilla.org/en-US/security/advisories/mfsa2026-45/ Reported by @ggwhyp

    Post summary

    Mozilla has publicly disclosed three CVEs involving JIT and SBX vulnerabilities, providing direct links to the relevant code changes and an advisory, but the text contains no evidence of PoC, exploit tools, or active exploitation.

    0201581.7K
    5.0K followersView on X
  • White Rabbitx 🏴‍☠️@TheRabbitPy
    Patch

    🧨 Firefox 150.0.3 is a critical patch. Here's an overview: CVE‑2026‑8401 – sandbox escape in Profile Backup CVE‑2026‑8391 – priv‑esca‑like “other” JS engine bug CVE‑2026‑8390 – UAF in JS:WebAssembly CVE‑2026‑8389 – JIT miscompilation in JS JIT CVE‑2026‑8388 – wrong boundary checks in JS JIT Any one of these can pop your browser; together they’re a browser‑pwn trifecta. #Firefox #CVE‑2026‑8401 #CVE‑2026‑8391 #CVE‑2026‑8390 #CVE‑2026‑8389 #CVE‑2026‑8388 #BrowserSecurity #JIT #WebAssembly #JavaScript #DevSecOps https://nvd.nist.gov/vuln/detail/CVE-2026-8401 https://nvd.nist.gov/vuln/detail/CVE-2026-8391 https://nvd.nist.gov/vuln/detail/CVE-2026-8390 https://nvd.nist.gov/vuln/detail/CVE-2026-8389 https://nvd.nist.gov/vuln/detail/CVE-2026-8388

    Post summary

    The post announces that Firefox 150.0.3 contains critical patches for five CVEs, describing each vulnerability type, but does not provide any PoC, exploit code, or evidence of active exploitation.

    0001082
    1.3K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---

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