CVE-2006-1800: Directory traversal vulnerability in posts.php in SimpleBBS 1.0.6 through 1.1 allows remote attackers to inclu

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HIGH 7.5DOWNGRADE

CVE-2006-1800 is a high-severity flaw (CVSS 7.5) affecting simplebbs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in posts.php in SimpleBBS 1.0.6 through 1.1 allows remote attackers to include and execute arbitrary files via ".." sequences in the language cookie, as demonstrated by by injecting the code into the gl_session cookie of users.php, which is stored in error.log.

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	2.7% (top 14%)
CISA exploited list	No
Published	2006-04-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: simplemedia

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

Am I affected?

Timeline

2006-04-18 10:02 UTCPublished CVE record published
2026-06-16 22:23 UTCUpdated Record last modified

simplemedia simplebbs DOWNGRADE

Affected: 1.0.6 · 1.0.7 · 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.6 (Debian / Ubuntu)

apt-cache madison simplebbs sudo apt install simplebbs=<VERSION_BEFORE_1.0.6> sudo apt-mark hold simplebbs

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

dnf --showduplicates list simplebbs sudo dnf downgrade simplebbs-<VERSION_BEFORE_1.0.6> sudo dnf versionlock add simplebbs

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: SimpleBBS 1.0.6/1.0.7/1.1 - Arbitrary Command Execution

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-2006-1800?

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

Is CVE-2006-1800 being exploited?

CVE-2006-1800 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-2006-1800 affect?

CVE-2006-1800 affects simplebbs. Severity is high (CVSS 7.5). Directory traversal vulnerability in posts.php in SimpleBBS 1.0.6 through 1.1 allows remote attackers to include and execute arbitrary files via ".." sequences in the language cookie, as demonstrated by by injecting the code into the gl_ses

How urgent is CVE-2006-1800?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2005-4135 HIGH 7.5 DOWNGRADE Direct static code injection vulnerability in includes/newtopic.php in SimpleBBS 1.1 and earlier allows remote
CVE-2005-4027 HIGH 7.5 DOWNGRADE SQL injection vulnerability in SimpleBBS 1.1 allows remote attackers to execute arbitrary SQL commands via uns

References

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