CVE-2009-0852: showme.php in CelerBB 0.0.2 allows remote attackers to obtain "reserved information" via the user parameter.

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MEDIUM 5.0DOWNGRADE

CVE-2009-0852 is a medium-severity flaw (CVSS 5.0) affecting celerbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

showme.php in CelerBB 0.0.2 allows remote attackers to obtain "reserved information" via the user parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-200
Published	2009-03-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: stewart howe

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

Am I affected?

Timeline

2009-03-09 17:30 UTCPublished CVE record published
2026-06-16 23:05 UTCUpdated Record last modified

stewart howe celerbb DOWNGRADE

Affected: 0.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.0.2 (Debian / Ubuntu)

apt-cache madison celerbb sudo apt install celerbb=<VERSION_BEFORE_0.0.2> sudo apt-mark hold celerbb

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

dnf --showduplicates list celerbb sudo dnf downgrade celerbb-<VERSION_BEFORE_0.0.2> sudo dnf versionlock add celerbb

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: celerbb 0.0.2 - Multiple Vulnerabilities

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-2009-0852?

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

Is CVE-2009-0852 being exploited?

CVE-2009-0852 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-2009-0852 affect?

CVE-2009-0852 affects celerbb. Severity is medium (CVSS 5.0). showme.php in CelerBB 0.0.2 allows remote attackers to obtain "reserved information" via the user parameter.

How urgent is CVE-2009-0852?

Priority 44/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2009-0853 MEDIUM 6.8 DOWNGRADE login.php in CelerBB 0.0.2, when magic_quotes_gpc is disabled, allows remote attackers to bypass authenticatio
CVE-2009-0851 MEDIUM 6.8 DOWNGRADE Multiple SQL injection vulnerabilities in CelerBB 0.0.2, when magic_quotes_gpc is disabled, allow remote attac

References

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