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8.8
Thunderbird may execute code after a worker stops
published 4 days ago
Summary
Thunderbird can be tricked into running a script after a background worker has been shut down. This means an attacker could cause code to run at a time it shouldn't, potentially affecting data or system behavior. Update Thunderbird to the latest version to close this gap.
What to do
- Update cleanstart thunderbird to version 91.6.0-r0.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | thunderbird |
< 91.6.0-r0 Fix: upgrade to 91.6.0-r0
|
Original advisory text
When a worker is shutdown, it was possible to cause script to run late in the lifecycle, at a point after where it should not be possible
Security vulnerability affects the thunderbird package. When a worker is shutdown, it was possible to cause script to run late in the lifecycle, at a point after where it should not be possible.
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published31 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-LH49338 · OSV
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