CVE-2026-25776: Movable Type provided by Six Apart Ltd

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-25776 is a critical-severity flaw (CVSS 9.8) affecting movable type. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-04-08
Last modified	2026-07-25

Publisher (CNA): JPCERT/CC · Vendor: sixapart

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 09:16 UTCPublished CVE record published
2026-07-25 10:10 UTCUpdated Record last modified

sixapart movable type UPGRADE

Affected: <= 2.14 · 9.0.5 · 9.0.6 · 9.1.0 · >= 8.0.2 and < 8.0.10 · >= 8.8.0 and < 8.8.3 · >= 9.0.1 and < 9.0.7

Fixed in: 8.0.10, 8.8.3, 9.0.7

Safe to downgrade to: a release before 8.0.2

1. Check installed version

apt-cache policy movable-type || rpm -q movable-type || movable-type --version

2. UPGRADE to 8.0.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade movable-type

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade movable-type

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.2 (Debian / Ubuntu)

apt-cache madison movable-type sudo apt install movable-type=<VERSION_BEFORE_8.0.2> sudo apt-mark hold movable-type

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list movable-type sudo dnf downgrade movable-type-<VERSION_BEFORE_8.0.2> sudo dnf versionlock add movable-type

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-25776?

movable type: upgrade to 8.0.10, 8.8.3, 9.0.7. Exact commands for each OS are on this page.

Is CVE-2026-25776 being exploited?

CVE-2026-25776 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-25776 affect?

CVE-2026-25776 affects movable type. Severity is critical (CVSS 9.8). Movable Type provided by Six Apart Ltd. contains a code injection vulnerability which may allow an attacker to execute arbitrary Perl script.

How urgent is CVE-2026-25776?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

Related CVEs

CVE-2026-33088 CRITICAL 9.8 UPGRADE Movable Type provided by Six Apart Ltd

References

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