Dashboard / CVE-2026-57963

CVE-2026-57963

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 73/100
Published: 2026-07-01 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: Low
I: Low
A: None

Description

An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
mozilla thunderbird < 140.12.1
mozilla thunderbird < 152.0.1

References & Advisories (3)

Bug Bounty Relevance

73 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploitation Probability

0.31%
Raw Score 0.003060
Percentile 23.3%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00306
2026-10-28
0.00306

Intelligence Sources

nvd ref →

External Links