Firefox Developer Edition (en-US) 138.0
Firefox Developer Edition (en-US) 138.0, released April 18, 2025, fixes 12 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.
Superseded. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every CVE on this page. Install that instead.
Priority of the 12 CVEs
Applies to
| Product | Version |
|---|---|
| Firefox Developer Edition (en-US) | 138.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2025-2817 | Privilege escalation in Thunderbird Updater | 8.8 | 0.0067 | None reported |
| High | CVE-2025-4091 | Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10 | 8.8 | 0.0051 | None reported |
| High | CVE-2025-4083 | Process isolation bypass using "javascript:" URI links in cross-origin frames | 9.1 | 0.0046 | None reported |
| High | CVE-2025-4087 | Unsafe attribute access during XPath parsing | 8.8 | 0.0032 | None reported |
| High | CVE-2025-4085 | Potential information leakage and privilege escalation in UITour actor | 7.1 | 0.0031 | None reported |
| Routine | CVE-2025-4082 | WebGL shader attribute memory corruption in Thunderbird for macOS | 5.9 | 0.0046 | None reported |
| Routine | CVE-2025-4090 | Leaked library paths in Thunderbird for Android | 5.3 | 0.0033 | None reported |
| Routine | CVE-2025-3608 | Race condition in nsHttpTransaction could lead to memory corruption | 6.5 | 0.0032 | None reported |
| Routine | CVE-2025-4092 | Memory safety bugs fixed in Firefox 138 and Thunderbird 138 | 6.5 | 0.0031 | None reported |
| Routine | CVE-2025-4086 | Specially crafted filename could be used to obscure download type | 6.5 | 0.0030 | None reported |
| Routine | CVE-2025-4089 | Potential local code execution in "copy as cURL" command | 5.1 | 0.0019 | None reported |
| Routine | CVE-2025-4088 | Cross-site request forgery via storage access API redirects | 6.5 | 0.0018 | None reported |
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