CVE-2026-8971Disclosure(mozilla / firefox)

LOWCVSS 6.5 · MEDIUM

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

Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

0.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-346

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

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
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
Products
firefoxthunderbird

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-19: 1Patch / Workaround · 2026-05-19: 1Technical Details · 2026-05-19: 105-19
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    CVE-2026-8971 Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151. https://www.cve.org/CVERecord?id=CVE-2026-8971

    Post summary

    The tweet announces CVE‑2026‑8971 – a same‑origin policy bypass in Mozilla’s networking JAR component – and notes the issue was fixed in Firefox 151 and Thunderbird 151; no PoC, exploit, or active‑use data are provided.

    00000149
    57.5K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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