Red Hat Enterprise Linux 8 update for thunderbird
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2025-3909 CVE-2025-3875 CVE-2025-3877 CVE-2025-3932 |
| CWE-ID | CWE-20 CWE-200 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Red Hat Enterprise Linux Server - AUS Operating systems & Components / Operating system thunderbird (Red Hat package) Operating systems & Components / Operating system package or component |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Input validation error
EUVDB-ID: #VU109192
Risk: High
CVSSv4.0: 6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2025-3909
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary JavaScript code.
The vulnerability exists due to incorrect handling of the X-Mozilla-External-Attachment-URL header. A remote attacker can create a nested email attachment, set its content type to application/pdf and force the application to execute arbitrary JavaScript code in the file:/// context.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 8.2
thunderbird (Red Hat package): before 128.10.1-1.el8_2
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:8.2:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:a:red_hat:thunderbird_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2025:8391
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Input validation error
EUVDB-ID: #VU109190
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2025-3875
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a spoofing attack
The vulnerability exists due to insufficient validation of email addresses. A remote attacker can spoof the sender email address via a specially crafted "From" field in the email..
Install updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 8.2
thunderbird (Red Hat package): before 128.10.1-1.el8_2
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:8.2:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:a:red_hat:thunderbird_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2025:8391
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Input validation error
EUVDB-ID: #VU109191
Risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2025-3877
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect handling of "mailbox:///" links. A remote attacker can trick the victim into clicking on such a link and force the application into downloading arbitrary file or leak credentials.
Install updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 8.2
thunderbird (Red Hat package): before 128.10.1-1.el8_2
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:8.2:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:a:red_hat:thunderbird_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2025:8391
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Information disclosure
EUVDB-ID: #VU109193
Risk: Low
CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2025-3932
CWE-ID:
CWE-200 - Exposure of sensitive information to an unauthorized actor
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to incorrect handling of tracking links. A remote attacker can create a specially crafted email message that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 8.2
thunderbird (Red Hat package): before 128.10.1-1.el8_2
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:8.2:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:a:red_hat:thunderbird_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2025:8391
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
