Mozilla Thunderbird up to 91.6 Fullscreen Mode Remote Code Execution

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Mozilla Thunderbird up to 91.6. Impacted is an unknown function of the component Fullscreen Mode. The manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2022-26383. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird up to 91.6 (Mail Client Software) and classified as critical. This issue affects an unknown code of the component Fullscreen Mode. Impacted is confidentiality, integrity, and availability.

The weakness was published 03/08/2022 by Irvan Kurniawan as Bug 1742421 as confirmed advisory (Website). The advisory is shared at bugzilla.mozilla.org. The advisory contains:

When resizing a popup after requesting fullscreen access, the popup would not display the fullscreen notification.

The identification of this vulnerability is CVE-2022-26383. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/09/2026).

Upgrading to version 91.7 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2022-30942). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 91.0
• 91.1
• 91.2
• 91.3
• 91.4
• 91.5
• 91.6

License

• open-source

Website

• Vendor: https://www.mozilla.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Remote Code Execution
CWE: Unknown
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Thunderbird 91.7

Timelineinfo

03/03/2022 🔍
03/08/2022 +5 days 🔍
03/08/2022 +0 days 🔍
09/29/2022 +205 days 🔍
05/09/2026 +1318 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1742421
Researcher: Irvan Kurniawan
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2022-26383 (🔍)
GCVE (CVE): GCVE-0-2022-26383
GCVE (VulDB): GCVE-100-209885
EUVD: 🔍

Entryinfo

Created: 09/29/2022 17:45
Updated: 05/09/2026 15:37
Changes: 09/29/2022 17:45 (13), 09/29/2022 17:46 (4), 09/29/2022 17:49 (28), 10/26/2022 08:56 (1), 05/09/2026 15:37 (15)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

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