| Release Date: | 2025-05-27 | |
| Impact: | Moderate | What is this? | 
Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability affects Firefox < 139, Firefox ESR < 115.24, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
See more information about CVE-2025-5263 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
| Base Score: | 6.1 | 
| Vector String: | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | 
| Version: | 3.1 | 
| Attack Vector: | Network | 
| Attack Complexity: | Low | 
| Privileges Required: | None | 
| User Interaction: | Required | 
| Scope: | Changed | 
| Confidentiality Impact: | Low | 
| Integrity Impact: | Low | 
| Availability Impact: | None | 
| Platform | Errata | Release Date | 
| Oracle Linux version 10 (firefox) | ELSA-2025-8341 | 2025-06-27 | 
| Oracle Linux version 10 (thunderbird) | ELSA-2025-8608 | 2025-06-27 | 
| Oracle Linux version 7 (firefox) | ELSA-2025-9074 | 2025-06-23 | 
| Oracle Linux version 8 (firefox) | ELSA-2025-8308 | 2025-05-29 | 
| Oracle Linux version 8 (thunderbird) | ELSA-2025-8756 | 2025-06-10 | 
| Oracle Linux version 9 (firefox) | ELSA-2025-8293 | 2025-05-29 | 
| Oracle Linux version 9 (thunderbird) | ELSA-2025-8607 | 2025-06-06 | 
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