CVE-2006-4759: PunBB 1.2.12 does not properly handle an avatar directory pathname ending in %00, which allows remote authenti

Routine

LOW 3.6DOWNGRADE

CVE-2006-4759 is a low-severity flaw (CVSS 3.6) affecting punbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PunBB 1.2.12 does not properly handle an avatar directory pathname ending in %00, which allows remote authenticated administrative users to upload arbitrary files and execute code, as demonstrated by a query to admin_options.php with an avatars_dir parameter ending in %00. NOTE: this issue was originally disputed by the vendor, but the dispute was withdrawn on 20060926.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	3.6 (Low)
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Published	2006-09-13
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: punbb

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

Am I affected?

Timeline

2006-09-13 23:07 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

punbb punbb DOWNGRADE

Affected: 1.2.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.12 (Debian / Ubuntu)

apt-cache madison punbb sudo apt install punbb=<VERSION_BEFORE_1.2.12> sudo apt-mark hold punbb

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

dnf --showduplicates list punbb sudo dnf downgrade punbb-<VERSION_BEFORE_1.2.12> sudo dnf versionlock add punbb

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-2006-4759?

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

Is CVE-2006-4759 being exploited?

CVE-2006-4759 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-2006-4759 affect?

CVE-2006-4759 affects punbb. Severity is low (CVSS 3.6). PunBB 1.2.12 does not properly handle an avatar directory pathname ending in %00, which allows remote authenticated administrative users to upload arbitrary files and execute code, as demonstrated by a query to admin_options.php with an ava

How urgent is CVE-2006-4759?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-28968 MEDIUM 5.4 UPGRADE An issue was discovered in PunBB before 1.4.6
CVE-2011-3371 MEDIUM 4.3 UPGRADE Multiple cross-site scripting (XSS) vulnerabilities in include/functions.php in PunBB before 1.3.6 allow remot
CVE-2010-0455 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in forum/viewtopic.php in PunBB 1.3 allows remote attackers to inject
CVE-2009-4894 MEDIUM 4.3 UPGRADE Multiple cross-site scripting (XSS) vulnerabilities in profile.php in PunBB before 1.3.4 allow remote attacker
CVE-2008-7241 MEDIUM 6.8 UPGRADE Cross-site request forgery (CSRF) vulnerability in PunBB before 1.2.17 allows remote attackers to hijack the a

References

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