Bug 2433720 (CVE-2026-0818)
| Summary: | CVE-2026-0818 thunderbird: CSS-based exfiltration of the content from partially encrypted emails when allowing remote content | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | unspecified | CC: | gotiwari, jgrulich, jhorak, mvyas, tpopela |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
When a user explicitly requested Thunderbird to decrypt an inline
OpenPGP message that was embedded in a text section of an email
that was formatted and styled with HTML and CSS, then the
decrypted contents were rendered in a context in which the CSS
styles from the outer messages were active. If the user had
additionally allowed loading of the remote content referenced by
the outer email message, and the email was crafted by the sender
using a combination of CSS rules and fonts and animations, then
it was possible to extract the secret contents of the email.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-01-28 08:01:28 UTC
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