CVE-2026-25691: A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet For

Routine

MEDIUM 6.7UPGRADEDOWNGRADE

CVE-2026-25691 is a medium-severity flaw (CVSS 6.7) affecting fortisandbox, fortisandbox cloud. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4, FortiSandbox PaaS 5.0.4 may allow a privileged attacker with super-admin profile and CLI access to delete an arbitrary directory via HTTP crafted requests.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): Fortinet, Inc. · Vendor: fortinet

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 16:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

fortinet fortisandbox UPGRADE

Affected: >= 4.2.0 and < 4.4.9 · >= 5.0.0 and < 5.0.6

Fixed in: 4.4.9, 5.0.6

Safe to downgrade to: a release before 4.2.0

1. Check installed version

apt-cache policy fortisandbox || rpm -q fortisandbox || fortisandbox --version

2. UPGRADE to 4.4.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fortisandbox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortisandbox

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 4.2.0 (Debian / Ubuntu)

apt-cache madison fortisandbox sudo apt install fortisandbox=<VERSION_BEFORE_4.2.0> sudo apt-mark hold fortisandbox

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

dnf --showduplicates list fortisandbox sudo dnf downgrade fortisandbox-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add fortisandbox

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.

fortinet fortisandbox cloud DOWNGRADE

Affected: 5.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.4

1. Check installed version

apt-cache policy fortisandbox-cloud || rpm -q fortisandbox-cloud || fortisandbox-cloud --version

2. No fixed release: DOWNGRADE to a release before 5.0.4 (Debian / Ubuntu)

apt-cache madison fortisandbox-cloud sudo apt install fortisandbox-cloud=<VERSION_BEFORE_5.0.4> sudo apt-mark hold fortisandbox-cloud

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fortisandbox-cloud sudo dnf downgrade fortisandbox-cloud-<VERSION_BEFORE_5.0.4> sudo dnf versionlock add fortisandbox-cloud

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-2026-25691?

fortisandbox: upgrade to 4.4.9, 5.0.6; fortisandbox cloud: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-25691 being exploited?

CVE-2026-25691 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-2026-25691 affect?

CVE-2026-25691 affects fortisandbox, fortisandbox cloud. Severity is medium (CVSS 6.7). A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4, FortiSan

How urgent is CVE-2026-25691?

Priority 33/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

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References

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