CVE-2008-6731: Unrestricted file upload vulnerability in submitlink.php in FlexPHPLink Pro 0.0.7 allows remote attackers to e

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HIGH 9.3DOWNGRADE

CVE-2008-6731 is a high-severity flaw (CVSS 9.3) affecting flexphplink. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted file upload vulnerability in submitlink.php in FlexPHPLink Pro 0.0.7 allows remote attackers to execute arbitrary PHP code by uploading a file with an executable extension, then accessing it via a direct request to the renamed file in linkphoto/.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-20
Published	2009-04-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: china-on-site

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-04-20 14:30 UTCPublished CVE record published
2026-06-16 23:02 UTCUpdated Record last modified

china-on-site flexphplink DOWNGRADE

Affected: 0.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.0.7 (Debian / Ubuntu)

apt-cache madison flexphplink sudo apt install flexphplink=<VERSION_BEFORE_0.0.7> sudo apt-mark hold flexphplink

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

dnf --showduplicates list flexphplink sudo dnf downgrade flexphplink-<VERSION_BEFORE_0.0.7> sudo dnf versionlock add flexphplink

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Flexphplink Pro - Arbitrary File Upload

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-2008-6731?

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

Is CVE-2008-6731 being exploited?

CVE-2008-6731 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-2008-6731 affect?

CVE-2008-6731 affects flexphplink. Severity is high (CVSS 9.3). Unrestricted file upload vulnerability in submitlink.php in FlexPHPLink Pro 0.0.7 allows remote attackers to execute arbitrary PHP code by uploading a file with an executable extension, then accessing it via a direct request to the renamed

How urgent is CVE-2008-6731?

Priority 61/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2008-6730 MEDIUM 6.8 DOWNGRADE Multiple SQL injection vulnerabilities in admin/usercheck.php in FlexPHPLink Pro 0.0.6 and 0.0.7, when magic_q

References

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