CVE-2002-0734: b2edit.showposts.php in B2 2.0.6pre2 and earlier does not properly load the b2config.php file in some configur

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HIGH 7.5DOWNGRADE

CVE-2002-0734 is a high-severity flaw (CVSS 7.5) affecting b2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

b2edit.showposts.php in B2 2.0.6pre2 and earlier does not properly load the b2config.php file in some configurations, which allows remote attackers to execute arbitrary PHP code via a URL that sets the $b2inc variable to point to a malicious program stored on a remote server.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.0% (top 6%)
CISA exploited list	No
Published	2002-08-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: michel valdrighi

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

Am I affected?

Timeline

2002-08-12 04:00 UTCPublished CVE record published
2026-06-16 21:58 UTCUpdated Record last modified

michel valdrighi b2 DOWNGRADE

Affected: 0.6_pre

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6_pre

1. Check installed version

apt-cache policy b2 || rpm -q b2 || b2 --version

2. No fixed release: DOWNGRADE to a release before 0.6_pre (Debian / Ubuntu)

apt-cache madison b2 sudo apt install b2=<VERSION_BEFORE_0.6_pre> sudo apt-mark hold b2

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

dnf --showduplicates list b2 sudo dnf downgrade b2-<VERSION_BEFORE_0.6_pre> sudo dnf versionlock add b2

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: B2 0.6 - 'b2edit.showposts.php?b2inc' Remote File Inclusion

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-2002-0734?

b2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-0734 being exploited?

CVE-2002-0734 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-2002-0734 affect?

CVE-2002-0734 affects b2. Severity is high (CVSS 7.5). b2edit.showposts.php in B2 2.0.6pre2 and earlier does not properly load the b2config.php file in some configurations, which allows remote attackers to execute arbitrary PHP code via a URL that sets the $b2inc variable to point to a maliciou

How urgent is CVE-2002-0734?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

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References

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