CVE-2003-0307: Poster version.two allows remote authenticated users to gain administrative privileges by appending the "|" fi

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HIGH 7.5DOWNGRADE

CVE-2003-0307 is a high-severity flaw (CVSS 7.5) affecting poster. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Poster version.two allows remote authenticated users to gain administrative privileges by appending the "|" field separator and an "admin" value into the email address field.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2003-06-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: poster

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

Am I affected?

Timeline

2003-06-09 04:00 UTCPublished CVE record published
2026-06-16 22:01 UTCUpdated Record last modified

poster poster DOWNGRADE

Affected: version.two

Fixed in: no fixed release known

Safe to downgrade to: a release before version.two

1. Check installed version

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

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

apt-cache madison poster sudo apt install poster=<VERSION_BEFORE_version.two> sudo apt-mark hold poster

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

dnf --showduplicates list poster sudo dnf downgrade poster-<VERSION_BEFORE_version.two> sudo dnf versionlock add poster

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-2003-0307?

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

Is CVE-2003-0307 being exploited?

CVE-2003-0307 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-2003-0307 affect?

CVE-2003-0307 affects poster. Severity is high (CVSS 7.5). Poster version.two allows remote authenticated users to gain administrative privileges by appending the "|" field separator and an "admin" value into the email address field.

How urgent is CVE-2003-0307?

Priority 44/100. High severity

References

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