Thunderbird CVE-2026-110249

EUVD-2026-99208

2026-10-13 mozilla

GHSA-3vgg-r2jh-qqpj

Information Disclosure Microsoft Mozilla Thunderbird

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Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5.

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Exploit and PoC references, threat intelligence from 22 sources

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Threat Intelligence Overview

EPSS Score

0.2%

Top 94% exploitable

Data Quality

1 sources

Confidence: Low

EUVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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9.3 Jan 13

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CVE-2013-0753 CRITICAL Act Now POC

9.3 Jan 13

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CVE-2012-3993 CRITICAL Emergency POC

9.3 Oct 10

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CVE-2013-1710 CRITICAL Emergency POC

10.0 Aug 07

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CVE-2013-0757 CRITICAL Emergency POC

9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi

CVE-2014-1510 CRITICAL Emergency POC

9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se

CVE-2014-1511 CRITICAL Emergency POC

9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo

CVE-2016-1960 HIGH Act Now POC

8.8 Mar 13

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CVE-2024-9680 CRITICAL Act Now POC

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CVE-2015-0816 MEDIUM This Month POC

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CVE-2025-24813 CRITICAL POC

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CVE-2025-68613 HIGH POC

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CVE-2015-1701 HIGH POC

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CVE-2017-0147 HIGH POC

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References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-110249 REF https://bugzilla.mozilla.org/show_bug.cgi?id=2077826 REF https://www.mozilla.org/security/advisories/mfsa2026-109/ REF https://www.mozilla.org/security/advisories/mfsa2026-110/

Search Externally

GitHub PoC

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