CVE-2004-1787: SQL injection vulnerability in PostCalendar 4.0.0 allows remote attackers to execute arbitrary SQL commands vi

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HIGH 7.5DOWNGRADE

CVE-2004-1787 is a high-severity flaw (CVSS 7.5) affecting postcalendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection vulnerability in PostCalendar 4.0.0 allows remote attackers to execute arbitrary SQL commands via search queries.

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	1.3% (top 29%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: postnuke software foundation

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:08 UTCUpdated Record last modified

postnuke software foundation postcalendar DOWNGRADE

Affected: 4.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison postcalendar sudo apt install postcalendar=<VERSION_BEFORE_4.0.0> sudo apt-mark hold postcalendar

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

dnf --showduplicates list postcalendar sudo dnf downgrade postcalendar-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add postcalendar

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-2004-1787?

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

Is CVE-2004-1787 being exploited?

CVE-2004-1787 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-2004-1787 affect?

CVE-2004-1787 affects postcalendar. Severity is high (CVSS 7.5). SQL injection vulnerability in PostCalendar 4.0.0 allows remote attackers to execute arbitrary SQL commands via search queries.

How urgent is CVE-2004-1787?

Priority 44/100. High severity

Related CVEs

CVE-2002-0739 HIGH 7.5 DOWNGRADE Cross-site scripting in PostCalendar 3.02 allows remote attackers to insert arbitrary HTML and script, and ste

References

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