CVE-2025-11711
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-14

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
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Meta Information
Published
2025-10-14
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2025-10-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11711
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox From 60.9.0 (exc)
mozilla thunderbird to 140.0 (inc)
mozilla thunderbird to 140.0 (inc)
mozilla firefox From 60.9.0 (exc)
mozilla firefox From 60.9.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-591 The product stores sensitive data in memory that is not locked, or that has been incorrectly locked, which might cause the memory to be written to swap files on disk by the virtual memory manager. This can make the data more accessible to external actors.
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Impact Analysis

By allowing modification of supposedly non-writeable JavaScript Object properties, this vulnerability could lead to unexpected behavior or security issues in affected applications, potentially enabling attackers to manipulate application logic or data in unintended ways.

Executive Summary

This vulnerability allows changing the value of JavaScript Object properties that were supposed to be non-writeable. Essentially, it breaks the intended immutability of certain object properties in Firefox and Thunderbird versions before the specified fixed releases.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 144 or later, Firefox ESR to version 115.29 or later, or Thunderbird to version 144 or later. Applying these updates will fix the issue related to changing non-writeable JavaScript Object properties.

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