Mozilla Thunderbird up to 91.9 allowCredential Entry cross-domain policy

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Mozilla Thunderbird up to 91.9. Affected is an unknown function of the component allowCredential Entry Handler. Performing a manipulation results in cross-domain policy. This vulnerability is reported as CVE-2022-31742. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird up to 91.9 (Mail Client Software). It has been classified as problematic. This affects some unknown functionality of the component allowCredential Entry Handler. The manipulation with an unknown input leads to a cross-domain policy vulnerability. CWE is classifying the issue as CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. This is going to have an impact on confidentiality. The summary by CVE is:

An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between invalid key handles and cross-origin key handles. This could have led to cross-origin account linking in violation of WebAuthn goals. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

The weakness was disclosed 05/31/2022 by Michal as Bug 1730434 as confirmed advisory (Website). It is possible to read the advisory at bugzilla.mozilla.org. The advisory contains:

An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between invalid key handles and cross-origin key handles. This could have led to cross-origin account linking in violation of WebAuthn goals.
This vulnerability is uniquely identified as CVE-2022-31742. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/10/2025).

The vulnerability scanner Nessus provides a plugin with the ID 246872 (Linux Distros Unpatched Vulnerability : CVE-2022-31742), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 91.10 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 Tenable (246872). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / CWE-346 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 246872
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2022-31742

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Thunderbird 91.10

Timelineinfo

05/26/2022 🔍
05/31/2022 +5 days 🔍
05/31/2022 +0 days 🔍
09/30/2022 +122 days 🔍
08/10/2025 +1045 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1730434
Researcher: Michal
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2022-31742 (🔍)
GCVE (CVE): GCVE-0-2022-31742
GCVE (VulDB): GCVE-100-209967

Entryinfo

Created: 09/30/2022 10:25
Updated: 08/10/2025 18:21
Changes: 09/30/2022 10:25 (14), 09/30/2022 10:26 (4), 09/30/2022 10:29 (28), 10/26/2022 15:07 (1), 04/15/2025 21:34 (27), 08/10/2025 18:21 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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