CVE-2026-2776Disclosure(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 due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

Weakness type (CWE)

CWE-119

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

Signal classification2 categories

Disclosure

375.0%

Patch

125.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-02-25	2	Disclosure2
2026-03-01	1	Disclosure1
2026-04-16	1	Patch1

Full discourse4 posts

Giuseppe Paternicola@giuseppe_1337175d
Patch
```json { "x": "🚨 CRITICAL: CVE-2026-2776 (CVSS 10.0) - Sandbox escape in Firefox/Thunderbird Telemetry component. Network exploitable, no user interaction required. Patch immediately to Firefox 148, ESR 115.33/140.8, Thunderbird 148/140.8. https://t.co/E8QzB3z4bw
Post summary
The tweet announces a critical sandbox‑escape CVE affecting Firefox and Thunderbird, urges immediate application of the specified patches, and details the vulnerability’s severity and technical context.
0000046
25 followersView on X
CRAC Learning - Tech@cracbot221d
Disclosure
CVE-2026-2776 (CVSS:10.0, CRITICAL) is Modified. Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability ..https://nvd.nist.gov/vuln/detail/CVE-2026-2776 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post announces CVE-2026-2776, a critical sandbox escape vulnerability in the Telemetry component of External Software, with CVSS 10.0, but provides no PoC, exploit, patch, or active exploitation details.
0000025
173 followersView on X
Infoflowcloud@infoflowcloud225d
Disclosure
🚨*CVE* CVE-2026-2776 Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and… https://www.cve.org/CVERecord?id=CVE-2026-2776 ----- Traducción: CVE-2026-2776 Esc… http://infoflow.cloud`
Post summary
The post announces CVE-2026-2776, a sandbox escape vulnerability in Firefox’s telemetry component, but provides no evidence of exploitation, PoC, or patch information.
0000045
54 followersView on X
CVE@CVEnew225d
Disclosure
CVE-2026-2776 Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and… https://www.cve.org/CVERecord?id=CVE-2026-2776
Post summary
The text announces CVE-2026-2776, a sandbox escape vulnerability in Firefox’s Telemetry component affecting versions below 148 and ESR below 115.33, with no PoC, exploit, or patch details provided.
00000218
56.6K followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-
App	mozilla	firefox	-	-	-
App	mozilla	thunderbird	-	-	-
App	mozilla	thunderbird	-	-	-

Explore more

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What researchers are saying

CVE-2026-2776

Giuseppe Paternicola[verified]@giuseppe_1337Patch

The tweet announces a critical sandbox‑escape CVE affecting Firefox and Thunderbird, urges immediate application of the specified patches, and details the vulnerability’s severity and technical context.

CRAC Learning - Tech@cracbotDisclosure

The post announces CVE-2026-2776, a critical sandbox escape vulnerability in the Telemetry component of External Software, with CVSS 10.0, but provides no PoC, exploit, patch, or active exploitation details.

Infoflowcloud@infoflowcloudDisclosure

The post announces CVE-2026-2776, a sandbox escape vulnerability in Firefox’s telemetry component, but provides no evidence of exploitation, PoC, or patch information.

CVE@CVEnewDisclosure

The text announces CVE-2026-2776, a sandbox escape vulnerability in Firefox’s Telemetry component affecting versions below 148 and ESR below 115.33, with no PoC, exploit, or patch details provided.