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Mozilla FirefoxSecurity Vulnerabilities fixed in Firefox 139.0.4

Risk 33
Severity
7
First published (updated )
Advisory
MFSA2025-47

Mozilla FirefoxMemory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2368752

Mozilla FirefoxDue to insufficient escaping of the newline character in the “Copy as cURL” feature, an attacker cou…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2368751

Mozilla FirefoxError handling for script execution was incorrectly isolated from web content, which could have allo…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2368756

Mozilla FirefoxScript elements loading cross-origin resources generated load and error events which leaked informat…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2368755
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Mozilla FirefoxA clickjacking vulnerability could have been used to trick a user into leaking saved payment card de…

Risk 5
Severity
1
First published (updated )
REDHAT-BUG-2368750

Mozilla ThunderbirdDouble Free

Risk 43
Severity
7.5
First published (updated )
CVE-2025-5262

Mozilla Firefox ESRA double-free could have occurred in vpx_codec_enc_init_multi after a failed allocation when initial…

Risk 42
Severity
9
First published (updated )
MFSA-TMP-2025-0001

Mozilla FirefoxZDI-25-291: (Pwn2Own) Mozilla Firefox IonMonkey JIT Compiler Integer Overflow Remote Code Execution Vulnerability

Risk 61
First published (updated )
ZDI-CAN-27172

Mozilla Firefox(Pwn2Own) Mozilla Firefox IonMonkey JIT Compiler Integer Overflow Remote Code Execution Vulnerability

Risk 67
First published (updated )
Advisory
ZDI-25-291
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Mozilla FirefoxSecurity Vulnerabilities fixed in Firefox for iOS 139

Risk 5
Severity
1
First published (updated )
Advisory
MFSA2025-39

BleepingComputerMozilla fixes Firefox zero-days exploited at hacking contest

Zeroday
First published (updated )
News
BleepingComputer

BleepingComputerHackers earn $1,078,750 for 28 zero-days at Pwn2Own Berlin

Exploited
Zeroday
First published (updated )
News
BleepingComputer

Mozilla Firefox2 vulnerabilities

Risk 42
Severity
9
First published (updated )
Advisory
MFSA2025-36

Rejected reason: Duplicate of CVE-2025-4918

Risk 36
Severity
9
EPSS
0.02%
First published (updated )
CVE-2025-4920

Rejected reason: Duplicate of CVE-2025-4919

Risk 36
Severity
9
EPSS
0.02%
First published (updated )
CVE-2025-4921

ZDNetYour password manager is under attack: How to defend yourself against a new threat

First published (updated )
News
ZDNet
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Mozilla ThunderbirdMozilla Firefox's update mechanism allowed a medium-integrity user process to interfere with the SYS…

Risk 33
Severity
7
First published (updated )
REDHAT-BUG-2362902

Mozilla ThunderbirdMemory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2362912

Mozilla ThunderbirdA process isolation vulnerability in Firefox stemmed from improper handling of javascript: URIs, whi…

Risk 33
Severity
7
First published (updated )
REDHAT-BUG-2362907

Mozilla ThunderbirdA vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due t…

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2362904

Mozilla ThunderbirdMemory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9…

Risk 19
Severity
4
First published (updated )
MFSA-RESERVE-2025-3
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Mozilla ThunderbirdModification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when ch…

Risk 33
Severity
7
First published (updated )
MFSA-RESERVE-2025-1937097

Mozilla FirefoxA security vulnerability in Firefox allowed malicious sites to use redirects to send credentialed re…

Risk 19
Severity
4
First published (updated )
MFSA-RESERVE-2025-1953521

Mozilla ThunderbirdA vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due t…

Risk 19
Severity
4
First published (updated )
MFSA-RESERVE-2025-1952465

Mozilla FirefoxDue to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could …

Risk 19
Severity
4
First published (updated )
MFSA-RESERVE-2025-1956698

Mozilla ThunderbirdAn attacker with control over a content process could potentially leverage the privileged UITour act…

Risk 19
Severity
4
First published (updated )
MFSA-RESERVE-2025-1915280
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Mozilla ThunderbirdMemory safety bugs present in Firefox 137 and Thunderbird 137. Some of these bugs showed evidence of…

Risk 33
Severity
7
First published (updated )
MFSA-RESERVE-2025-4

Mozilla ThunderbirdA vulnerability existed in Firefox for Android where potentially sensitive library locations were lo…

Risk 5
Severity
1
First published (updated )
MFSA-RESERVE-2025-1929478

Mozilla ThunderbirdA process isolation vulnerability in Firefox stemmed from improper handling of javascript: URIs, whi…

Risk 33
Severity
7
First published (updated )
MFSA-RESERVE-2025-1958350

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