What’s Vulnerable › Vulnerabilities

CVE-2023-25729

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-02 · updated 2026-06-17
• Weakness: CWE-863

Description

Permission prompts for opening external schemes were only shown for <code>ContentPrincipals</code> resulting in extensions being able to open them without user interaction via <code>ExpandedPrincipals</code>. This could lead to further malicious actions such as downloading files or interacting with software already installed on the system. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

Affected products

• Mozilla Firefox: before 110.0 — fixed in 110.0
• Mozilla Firefox ESR: before 102.8 — fixed in 102.8
• Mozilla Thunderbird: before 102.8 — fixed in 102.8

How to fix

Upgrade to a fixed version: Mozilla Firefox 110.0; Mozilla Firefox ESR 102.8; Mozilla Thunderbird 102.8. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1792138
• https://www.mozilla.org/security/advisories/mfsa2023-05/
• https://www.mozilla.org/security/advisories/mfsa2023-06/
• https://www.mozilla.org/security/advisories/mfsa2023-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1792138
• https://www.mozilla.org/security/advisories/mfsa2023-05/
• https://www.mozilla.org/security/advisories/mfsa2023-06/
• https://www.mozilla.org/security/advisories/mfsa2023-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1792138

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