CVE-2005-0831: PHP-Post allows remote attackers to spoof the names of other users by registering with a username containing h

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-0831 is a medium-severity flaw (CVSS 5.0) affecting php-post web forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP-Post allows remote attackers to spoof the names of other users by registering with a username containing hex-encoded characters.

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	1.1% (top 34%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: php-post

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:11 UTCUpdated Record last modified

php-post php-post web forum DOWNGRADE

Affected: 0.1 · 0.2 · 0.3 · 0.21 · 0.22 · 0.32

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1

1. Check installed version

apt-cache policy php-post-web-forum || rpm -q php-post-web-forum || php-post-web-forum --version

2. No fixed release: DOWNGRADE to a release before 0.1 (Debian / Ubuntu)

apt-cache madison php-post-web-forum sudo apt install php-post-web-forum=<VERSION_BEFORE_0.1> sudo apt-mark hold php-post-web-forum

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

dnf --showduplicates list php-post-web-forum sudo dnf downgrade php-post-web-forum-<VERSION_BEFORE_0.1> sudo dnf versionlock add php-post-web-forum

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-2005-0831?

php-post web forum: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-0831 being exploited?

CVE-2005-0831 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-2005-0831 affect?

CVE-2005-0831 affects php-post web forum. Severity is medium (CVSS 5.0). PHP-Post allows remote attackers to spoof the names of other users by registering with a username containing hex-encoded characters.

How urgent is CVE-2005-0831?

Priority 39/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2005-0832 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in PHP-Post before 0.33 allows remote attackers to inject arbitrary w

References

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