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Vulnerability · Published Apr 8, 2026 · Assigned by jpcert

CVE-2026-25776

Critical 9.8

In plain English

A critical-severity code injection in Movable Type from Six Apart Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.0)9.8Critical
Exploit odds (30 days)0.7%top 47.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Movable Type provided by Six Apart Ltd. contains a code injection vulnerability which may allow an attacker to execute arbitrary Perl script.

Affected products (as reported)

VendorProductVersions
Six Apart Ltd. Movable Type 9.1.0 and earlier
Six Apart Ltd. Movable Type 9.0.6 and earlier
Six Apart Ltd. Movable Type 8.8.2 and earlier
Six Apart Ltd. Movable Type 8.0.9 and earlier
Six Apart Ltd. Movable Type Advanced 9.1.0 and earlier
Six Apart Ltd. Movable Type Advanced 9.0.6 and earlier
Six Apart Ltd. Movable Type Advanced 8.8.2 and earlier
Six Apart Ltd. Movable Type Advanced 8.0.9 and earlier
Six Apart Ltd. Movable Type Premium 9.1.0 and earlier
Six Apart Ltd. Movable Type Premium 9.0.6 and earlier
Six Apart Ltd. Movable Type Premium Advanced Edition 9.1.0 and earlier
Six Apart Ltd. Movable Type Premium Advanced Edition 9.0.6 and earlier
Six Apart Ltd. Movable Type Premium 2.14 and earlier
Six Apart Ltd. Movable Type Premium Advanced Edition 2.14 and earlier
Six Apart Ltd. Movable Type Premium (MT8-based) 2.14 and earlier
Six Apart Ltd. Movable Type 5.1 to 5.18
Six Apart Ltd. Movable Type 5.25.2.1 to 5.2.13
Six Apart Ltd. Movable Type 6.06.0.1 to 6.8.8
Six Apart Ltd. Movable Type 7 r.4207 to r.5510
Six Apart Ltd. Movable Type 8.4.0 to 8.4.4
Six Apart Ltd. Movable Type 1.0 to 1.68

Weakness: CWE-94 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References