How severe is CVE-2026-25690?

CVE-2026-25690 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-25690 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25690?

CVE-2026-25690 primarily affects Fortinet Fortideceptor. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25690?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25690 have an EU (EUVD) identifier?

Yes. CVE-2026-25690 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29549.

When was CVE-2026-25690 published?

CVE-2026-25690 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-25690

CVE-2026-25690 is a medium-severity vulnerability in Fortinet Fortideceptor with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-88.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29549
Weakness: CWE-88
Affected product: Fortinet Fortideceptor
Published: 2026-05-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-25690?: 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.
How severe is CVE-2026-25690?: CVE-2026-25690 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-25690 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25690?: CVE-2026-25690 primarily affects Fortinet Fortideceptor. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25690?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25690 have an EU (EUVD) identifier?: Yes. CVE-2026-25690 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29549.
When was CVE-2026-25690 published?: CVE-2026-25690 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-138

Affected products (3)

cpe:2.3:a:fortinet:fortideceptor:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortideceptor:5.2.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortideceptor:5.2.1:*:*:*:*:*:*:*

More vulnerabilities in Fortinet Fortideceptor

CVE-2022-27487 — High (CVSS 8.8): A improper privilege management in Fortinet FortiSandbox version 4.2.0 through 4.2.2, 4.0.0 through 4.0.2 and before…
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CVE-2022-38373 — High (CVSS 8.0): An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiDeceptor management…
CVE-2026-25689 — Medium (CVSS 6.5): An improper neutralization of argument delimiters in a command ('argument injection') vulnerability in Fortinet…
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