CVE-2025-6866: A vulnerability has been found in code-projects Simple Forum 1.0 and classified as critical

Routine

MEDIUM 4.3DOWNGRADE

CVE-2025-6866 is a medium-severity flaw (CVSS 4.3) affecting simple forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-22
Published	2025-06-29
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: fabian

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-29 18:15 UTCPublished CVE record published
2026-06-17 10:02 UTCUpdated Record last modified

fabian simple forum DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy simple-forum || rpm -q simple-forum || simple-forum --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison simple-forum sudo apt install simple-forum=<VERSION_BEFORE_1.0> sudo apt-mark hold simple-forum

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

dnf --showduplicates list simple-forum sudo dnf downgrade simple-forum-<VERSION_BEFORE_1.0> sudo dnf versionlock add simple-forum

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-2025-6866?

simple forum: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-6866 being exploited?

CVE-2025-6866 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-2025-6866 affect?

CVE-2025-6866 affects simple forum. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2025-6866?

Priority 32/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-6850 MEDIUM 6.3 DOWNGRADE A vulnerability has been found in code-projects Simple Forum 1.0 and classified as critical
CVE-2025-6849 LOW 3.5 DOWNGRADE A vulnerability, which was classified as problematic, was found in code-projects Simple Forum 1.0
CVE-2025-6848 MEDIUM 6.3 DOWNGRADE A vulnerability, which was classified as critical, has been found in code-projects Simple Forum 1.0
CVE-2025-6847 MEDIUM 6.3 DOWNGRADE A vulnerability classified as critical was found in code-projects Simple Forum 1.0
CVE-2025-6846 HIGH 7.3 DOWNGRADE A vulnerability classified as critical has been found in code-projects Simple Forum 1.0

References

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