CVE-2006-0891: Multiple directory traversal vulnerabilities in NOCC Webmail 1.0 allow remote attackers to include arbitrary f

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MEDIUM 5.0DOWNGRADE

CVE-2006-0891 is a medium-severity flaw (CVSS 5.0) affecting nocc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple directory traversal vulnerabilities in NOCC Webmail 1.0 allow remote attackers to include arbitrary files via .. (dot dot) sequences and a trailing NULL (%00) byte in (1) the _SESSION['nocc_theme'] parameter in (a) html/footer.php; and (2) the lang and (3) theme parameters and the (4) Accept-Language HTTP header field, when force_default_lang is disabled, in (b) index.php, as demonstrated by injecting PHP code into a profile and accessin

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	8.5% (top 5%)
CISA exploited list	No
Published	2006-02-25
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nocc

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

Am I affected?

Timeline

2006-02-25 11:02 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

nocc nocc DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison nocc sudo apt install nocc=<VERSION_BEFORE_1.0> sudo apt-mark hold nocc

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

dnf --showduplicates list nocc sudo dnf downgrade nocc-<VERSION_BEFORE_1.0> sudo dnf versionlock add nocc

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: NOCC Webmail 1.0 - Local File Inclusion / Remote Code 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-2006-0891?

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

Is CVE-2006-0891 being exploited?

CVE-2006-0891 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-2006-0891 affect?

CVE-2006-0891 affects nocc. Severity is medium (CVSS 5.0). Multiple directory traversal vulnerabilities in NOCC Webmail 1.0 allow remote attackers to include arbitrary files via .. (dot dot) sequences and a trailing NULL (%00) byte in (1) the _SESSION['nocc_theme'] parameter in (a) html/footer.php;

How urgent is CVE-2006-0891?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-0895 MEDIUM 5.0 DOWNGRADE NOCC Webmail 1.0 allows remote attackers to obtain the installation path via a direct request to html/header.p
CVE-2006-0894 MEDIUM 4.3 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in NOCC Webmail 1.0 allow remote attackers to inject arbit
CVE-2006-0893 MEDIUM 5.0 DOWNGRADE NOCC Webmail 1.0 allows remote attackers to obtain sensitive information via a direct request to (1) the profi
CVE-2006-0892 HIGH 7.5 DOWNGRADE NOCC Webmail 1.0 stores e-mail attachments in temporary files with predictable filenames, which makes it easie
CVE-2002-2343 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in NOCC 0.9 through 0.9.5 allows remote attackers to inject arbitrary

References

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