CVE-2026-113866

mediumpriority · track · 0EPSS 0.004 · 30 %ileDEFR

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.36% (30th) EPSS

CVSS 5.9 · medium

Is it mine?

11 products

Check your exposure

Who says so?

2 sources

cert_bund · certfr

EPSS · scored 2026-10-27

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 2.2 · impact 3.6

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · CISA ADP (Vulnrichment)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-523USCWE-523US

affected products (11)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Broadcom Fabric OSall versionscert_bundDEcpe:/o:broadcom:fabric_operating_system:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Mozilla Firefox≤ Android <158.0.2cert_bundDE
Mozilla Firefox< 158.0.1cert_bundDE
Mozilla Firefox ESR< 115.43.1cert_bundDE
Mozilla Firefox ESR< 153.5.1cert_bundDE
Mozilla Thunderbird< 153.5.1cert_bundDE
Mozilla Thunderbird< 158.0.1cert_bundDE

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-4064Mozilla Produkte (Thunderbird, Firefox ESR und Firefox): Mehrere SchwachstellenDeutsch2026-10-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mozilla Thunderbird, Mozilla Firefox ESR und Mozilla Firefox ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen und um Daten zu manipulieren.
CERTFR-2026-AVI-1346Multiples vulnérabilités dans les produits MozillaFrançais2026-10-21vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund certfr NVD CVE.org MITRE

published 2026-10-20modified 2026-10-22

references (3) nvd

External citations — patches, advisories, analysis.

scry

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