Exim und cPanel/WHM: Mehrere Schwachstellen
WID-SEC-2026-1334 · first 04.05.2026 · updated 14.08.2026 · CVSS 6,5
What it is about
Exim (EXperimental Internet Mailer) ist ein Mailserver und Mail Transfer Agent. cPanel ist eine Software für die Verwaltung von Webhosting Auftritten. Die Software ermöglicht es dem Endanwender, Statistiken einzusehen, neue Benutzeraccounts anzulegen, Maileinstellungen zu verändern und vieles mehr. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Exim und cPanel cPanel/WHM ausnutzen, um einen Denial of Service Angriff durchzuführen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
- Daten zu manipulieren oder vertrauliche Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Debian Linux
- Ubuntu Linux
- Gentoo Linux
- Open Source Exim <4.99.2
- cPanel cPanel/WHM <110.0.112
- cPanel cPanel/WHM <118.0.64
- cPanel cPanel/WHM <126.0.56
- cPanel cPanel/WHM <134.0.23
- cPanel cPanel/WHM <136.0.7
- cPanel cPanel/WHM <136.0.14
- cPanel cPanel/WHM <134.0.30
- cPanel cPanel/WHM 126.0.63
and 1 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Exim 4.99.2
- cPanel cPanel/WHM 110.0.112
- cPanel cPanel/WHM 118.0.64
- cPanel cPanel/WHM 126.0.56
- cPanel cPanel/WHM 134.0.23
- cPanel cPanel/WHM 136.0.7
- cPanel cPanel/WHM 136.0.14
- cPanel cPanel/WHM 134.0.30
- cPanel cPanel/WHM 137.9999.96
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Exim Announce vom 2026-05-03 lists.exim.org
- cPanel Change Log vom 2026-05-03 docs.cpanel.net
- cPanel Change Log vom 2026-05-03 docs.cpanel.net
- cPanel Change Log vom 2026-05-03 docs.cpanel.net
- cPanel Change Log vom 2026-05-03 docs.cpanel.net
- cPanel Change Log vom 2026-05-03 docs.cpanel.net
- Ubuntu Security Notice USN-8228-1 vom 2026-05-04 ubuntu.com
- Debian Security Advisory DSA-6265 vom 2026-05-12 lists.debian.org
- cPanel & WHM Change Log vom 2026-07-27 docs.cpanel.net
- Gentoo Linux Security Advisory GLSA-202608-07 vom 2026-08-14 security.gentoo.org
CVE: CVE-2026-40684, CVE-2026-40685, CVE-2026-40686, CVE-2026-40687
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.