Vulnerability · Published Mar 10, 2025 · Assigned by mozilla
CVE-2025-26696Crafted email message incorrectly shown as being encrypted
High 7.0
In plain English
A high-severity authentication bypass by spoofing in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.0High
Exploit odds (30 days)0.4%top 70.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | thunderbird | 128.8.0-2.el8_10.alma.1 | ALSA-2025:2900 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DSA-5876-1 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-26696 |
| Debian:13 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-26696 |
| Debian:14 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-26696 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-26696 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | see references |
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L