Mozilla Thunderbird up to 115.0.1 XLL Add-In File access control

Summaryinfo

A vulnerability categorized as critical has been discovered in Mozilla Thunderbird. This impacts an unknown function of the component XLL Add-In File. Executing a manipulation can lead to access control. This vulnerability is registered as CVE-2023-4581. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird (Mail Client Software). It has been declared as critical. This vulnerability affects an unknown functionality of the component XLL Add-In File. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, and Thunderbird < 115.2.

The weakness was published 09/11/2023. The advisory is shared for download at mozilla.org. This vulnerability was named CVE-2023-4581 since 08/29/2023. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/20/2025). The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 239763 (TencentOS Server 4: thunderbird (TSSA-2024:0450)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 115.2 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the vulnerability database at Tenable (239763). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.7.1
• 0.7.2
• 0.7.3
• 0.8
• 0.9
• 1
• 1.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.1.8
• 1.5
• 1.5.0.1
• 1.5.0.2
• 1.5.0.3
• 1.5.0.4
• 1.5.0.5
• 1.5.0.6
• 1.5.0.7
• 1.5.0.8
• 1.5.0.9
• 1.5.0.10
• 1.5.0.11
• 2
• 2.0.0.5
• 2.0.0.11
• 2.0.0.19
• 2.0.14
• 3.11.5
• 13.0
• 14
• 15
• 16
• 16.0.1
• 16.0.2
• 17.0
• 17.0.1
• 17.0.2
• 17.0.3
• 17.0.4
• 17.0.5
• 17.0.6
• 17.0.7
• 17.0.8
• 17.0.10
• 18.0
• 20.0
• 21.0
• 23.0
• 24.0
• 25.0
• 30.0
• 31
• 45.6
• 52.5.2
• 52.6
• 52.8
• 52.9
• 60.5
• 60.5.0
• 60.5.1
• 60.7.1
• 62.0
• 68.1
• 68.1.1
• 68.5
• 68.8.0
• 68.9.0
• 68.10.0
• 68.12
• 78.5.1
• 78.6.1
• 78.7
• 78.8.1
• 78.9.1
• 78.10
• 78.10.1
• 78.10.2
• 78.12
• 91.0
• 91.0.1
• 91.2
• 91.3.0
• 91.4.0
• 91.4.1
• 91.5
• 91.6
• 91.6.1
• 91.7
• 91.8
• 91.9
• 91.10
• 91.11
• 91.13.1
• 101
• 102
• 102.1
• 102.2
• 102.3
• 102.4
• 102.5
• 102.5.1
• 102.6
• 102.7
• 102.7.1
• 102.8
• 102.9
• 102.9.1
• 102.10
• 102.11
• 102.12
• 102.13
• 115.0.1

License

• open-source

Website

• Vendor: https://www.mozilla.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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