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CVE-2026-74989— Internally found bugs fixed in Thunderbird 154

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox是Mozilla基金会开源的一款网页浏览器。 Mozilla Firefox153版本存在安全漏洞，该漏洞源于内部发现的多个缺陷，部分缺陷存在内存损坏或其他安全相关缺陷，可能被利用。

AI Predicted 6.8 Difficulty: Hard EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Firefox 154≤ * unaffected
Mozilla Thunderbird 154≤ * unaffected
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I. Basic Information for CVE-2026-74989

Vulnerability Information
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Vulnerability Title
Internally found bugs fixed in Thunderbird 154
Source: CVE Program / CVE List V5
Vulnerability Description
Internally found bugs present in Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Thunderbird 154.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是Mozilla基金会开源的一款网页浏览器。 Mozilla Firefox153版本存在安全漏洞，该漏洞源于内部发现的多个缺陷，部分缺陷存在内存损坏或其他安全相关缺陷，可能被利用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 154 ~ * -
Mozilla Thunderbird 154 ~ * -

II. Public POCs for CVE-2026-74989

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III. Intelligence Information for CVE-2026-74989

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Patches & Fixes for CVE-2026-74989 (1)

Vendor Advisories for CVE-2026-74989 (3)

Same Patch Batch · Mozilla · 2026-08-18 · 58 CVEs total

CVE-2026-74951 Clickjacking issue in Firefox for Android
CVE-2026-74978 Clickjacking issue in the Widget component
CVE-2026-74985 Privilege escalation in the Enterprise Policies component
CVE-2026-74984 Race condition in the JavaScript Engine component
CVE-2026-74979 Mitigation bypass in the Add-ons Manager component
CVE-2026-74982 Denial-of-service in the Widget component
CVE-2026-74958 Information disclosure in the WebRTC component
CVE-2026-74966 Information disclosure in the Form Autofill component
CVE-2026-74956 Same-origin policy bypass in the DOM: Service Workers component
CVE-2026-74952 Privilege escalation in the Application Update component
CVE-2026-74961 Side-channel in the Web Audio component
CVE-2026-74955 Privilege escalation in the Request Handling component
CVE-2026-74954 Information disclosure due to side-channel in the Storage: Cache API component
CVE-2026-74937 Use-after-free in the JavaScript: GC component
CVE-2026-74938 Mitigation bypass in the JavaScript: GC component
CVE-2026-74950 Privilege escalation in the Downloads API component
CVE-2026-74947 Privilege escalation due to invalid pointer in the Graphics component
CVE-2026-74983 Mitigation bypass in the Data Loss Prevention component
CVE-2026-74990 Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbi
CVE-2026-74987 Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbi

Showing top 20 of 58 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-74989

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