TI-2026-71885 Aliases CVE-2026-109771 GHSA-qhc6-j47q-3hvp

Information disclosure in Mozilla Firefox and Thunderbird WebRTC networking

LOW 19CWE-200Published 2026-10-13 · Updated 2026-10-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-200.

Summary

Mozilla Firefox and Thunderbird contain an information disclosure flaw in the WebRTC Networking component. The source description does not detail the exact condition, but the flaw exposes sensitive information to an unauthorized actor (CWE-200). A remote attacker can read information without authentication, but the user must interact with the page or message. Exploitation is not reported in the facts.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

Information disclosure in the WebRTC: Networking component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00203 10th percentileScored 2026-11-07

Fix Fixed Firefox (Mozilla): 158Thunderbird (Mozilla): 158

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox	—	158	Patch available	CNA
Mozilla	Thunderbird	—	158	Patch available	CNA

Firefox VendorMozilla Affected — Fixed in 158 Patch available CNA
Thunderbird VendorMozilla Affected — Fixed in 158 Patch available CNA

CPE names Threatist (inferred) · 2

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	—	—	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	—	—	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions — — ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions — — ·Mozilla

Remediation

Mozilla Firefox is fixed in version 158 and Thunderbird is fixed in version 158. Update Firefox and Thunderbird to version 158 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Fix · CNA Firefox (Mozilla) Fixed in 158
Fix · CNA Thunderbird (Mozilla) Fixed in 158

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Not affected: 5 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-13 Threatist record created from CVE-2026-109771
2026-10-13 Alias added: GHSA-qhc6-j47q-3hvp
2026-10-13 Fix available: Mozilla/Thunderbird@158 · CNA
2026-10-13 1 new reference · CNA
2026-10-31 Affected versions changed · Red Hat
2026-10-31 CVSS score added · Red Hat

References

Other 3

TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8

See all 4204 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences