How severe is CVE-2025-6866?

CVE-2025-6866 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-2025-6866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6866?

CVE-2025-6866 affects Fabian Simple Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6866?

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

Does CVE-2025-6866 have an EU (EUVD) identifier?

Yes. CVE-2025-6866 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19490.

When was CVE-2025-6866 published?

CVE-2025-6866 was published on 2025-06-29 and last updated on 2026-06-17.

CVE-2025-6866

CVE-2025-6866 is a medium-severity vulnerability in Fabian Simple Forum 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
CVSS v4: 2.1
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19490
Weakness: CWE-22
Affected product: Fabian Simple Forum
Published: 2025-06-29
Last modified: 2026-06-17

Description

A vulnerability has been found in code-projects Simple Forum 1.0 and classified as critical. This vulnerability affects unknown code of the file /forum_downloadfile.php. The manipulation of the argument filename leads to path traversal. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-6866?: A vulnerability has been found in code-projects Simple Forum 1.0 and classified as critical. This vulnerability affects unknown code of the file /forum_downloadfile.php. The manipulation of the argument filename leads to path traversal. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-6866?: CVE-2025-6866 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-2025-6866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6866?: CVE-2025-6866 affects Fabian Simple Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6866?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-6866 have an EU (EUVD) identifier?: Yes. CVE-2025-6866 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19490.
When was CVE-2025-6866 published?: CVE-2025-6866 was published on 2025-06-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fabian:simple_forum:1.0:*:*:*:*:*:*:*

More vulnerabilities in Fabian Simple Forum

CVE-2025-6846 — High (CVSS 7.3): A vulnerability classified as critical has been found in code-projects Simple Forum 1.0. This affects an unknown part…
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