CVE-2026-25690: An improper neutralization of argument delimiters in a command ('argument injection') vulnerability in Fortine

Routine

MEDIUM 4.3UPGRADE

CVE-2026-25690 is a medium-severity flaw (CVSS 4.3) affecting fortideceptor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper neutralization of argument delimiters in a command ('argument injection') vulnerability in Fortinet FortiDeceptor 6.0.0 through 6.0.2, FortiDeceptor 5.3.0 through 5.3.3, FortiDeceptor 5.2.0 through 5.2.1, FortiDeceptor 5.1 all versions, FortiDeceptor 5.0 all versions may allow an authenticated attacker with at least read-only admin permission to read log files via HTTP crafted requests.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-88
Published	2026-05-12
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

2026-05-12 18:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

fortinet fortideceptor UPGRADE

Affected: >= 5.0.0 and <= 5.1.0 · >= 5.3.0 and <= 5.3.3 · >= 6.0.0 and <= 6.0.2 · 5.2.0 · 5.2.1

Fixed in: newer than 6.0.2

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. UPGRADE to newer than 6.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortideceptor

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 5.0.0 (Debian / Ubuntu)

apt-cache madison fortideceptor sudo apt install fortideceptor=<VERSION_BEFORE_5.0.0> sudo apt-mark hold fortideceptor

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

dnf --showduplicates list fortideceptor sudo dnf downgrade fortideceptor-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add fortideceptor

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-2026-25690?

fortideceptor: upgrade to newer than 6.0.2. Exact commands for each OS are on this page.

Is CVE-2026-25690 being exploited?

CVE-2026-25690 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-2026-25690 affect?

CVE-2026-25690 affects fortideceptor. Severity is medium (CVSS 4.3). An improper neutralization of argument delimiters in a command ('argument injection') vulnerability in Fortinet FortiDeceptor 6.0.0 through 6.0.2, FortiDeceptor 5.3.0 through 5.3.3, FortiDeceptor 5.2.0 through 5.2.1, FortiDeceptor 5.1 all v

How urgent is CVE-2026-25690?

Priority 19/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

References

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