Security Flaw in Firefox Browser Affecting Multiple Versions
CVE-2025-10528

7.3HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
16 September 2025

What is CVE-2025-10528?

A security vulnerability has been identified in Firefox and Firefox ESR that could allow an attacker to execute malicious code. This flaw is present in Firefox versions earlier than 143 and Firefox ESR versions prior to 140.3. Users of affected versions may be at risk of exploitation, and it is highly recommended to update to the latest versions to ensure protection against potential threats. For more detailed information, refer to Mozilla's security advisories.

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Affected Version(s)

Firefox < 143

Firefox ESR < 140.3

Thunderbird < 143

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1986185
https://www.mozilla.org/security/advisories/mfsa2025-73/
https://www.mozilla.org/security/advisories/mfsa2025-75/

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Oskar L
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