CVE-2008-6307: E-topbiz Link Back Checker 1 allows remote attackers to bypass authentication and gain administrative access b

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HIGH 7.5DOWNGRADE

CVE-2008-6307 is a high-severity flaw (CVSS 7.5) affecting link back checker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

E-topbiz Link Back Checker 1 allows remote attackers to bypass authentication and gain administrative access by setting the auth cookie to "admin."

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-287
Published	2009-02-26
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: e-topbiz

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

Am I affected?

Timeline

2009-02-26 23:30 UTCPublished CVE record published
2026-06-16 23:01 UTCUpdated Record last modified

e-topbiz link back checker DOWNGRADE

Affected: 1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1

1. Check installed version

apt-cache policy link-back-checker || rpm -q link-back-checker || link-back-checker --version

2. No fixed release: DOWNGRADE to a release before 1 (Debian / Ubuntu)

apt-cache madison link-back-checker sudo apt install link-back-checker=<VERSION_BEFORE_1> sudo apt-mark hold link-back-checker

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

dnf --showduplicates list link-back-checker sudo dnf downgrade link-back-checker-<VERSION_BEFORE_1> sudo dnf versionlock add link-back-checker

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: E-topbiz Link Back Checker 1 - Insecure Cookie Handling

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-2008-6307?

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

Is CVE-2008-6307 being exploited?

CVE-2008-6307 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-2008-6307 affect?

CVE-2008-6307 affects link back checker. Severity is high (CVSS 7.5). E-topbiz Link Back Checker 1 allows remote attackers to bypass authentication and gain administrative access by setting the auth cookie to "admin."

How urgent is CVE-2008-6307?

Priority 53/100. High severity; Public exploit reference

References

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