Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affecting thunderbird package, versions [,158.0.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 Oct 2026
- disclosed20 Oct 2026
- creditUnknown
Introduced: 20 Oct 2026
NewCVE-2026-113867 (opens in a new tab)How to fix?
Upgrade thunderbird to version 158.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') via improper escaping of attribute values during the serialization process of outgoing XMPP stanzas. An attacker can inject arbitrary XMPP stanzas into the user's connection by sending crafted requests, resulting in the server processing these stanzas as if sent by the user, which can lead to unauthorized message sending or modification of contact and subscription settings without user interaction. This is only exploitable if the chat feature is enabled with XMPP accounts.