CVE-2008-5764: PHP remote file inclusion vulnerability in calendar.php in WorkSimple 1.2.1, when register_globals is enabled,

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HIGH 9.3DOWNGRADE

CVE-2008-5764 is a high-severity flaw (CVSS 9.3) affecting worksimple. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP remote file inclusion vulnerability in calendar.php in WorkSimple 1.2.1, when register_globals is enabled, allows remote attackers to execute arbitrary PHP code via a URL in the lang parameter.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	45.4% (top 1%)
CISA exploited list	No
Weakness	CWE-94
Published	2008-12-30
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: 2500mhz

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

Am I affected?

Timeline

2008-12-30 20:30 UTCPublished CVE record published
2026-06-16 23:00 UTCUpdated Record last modified

2500mhz worksimple DOWNGRADE

Affected: 1.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.1 (Debian / Ubuntu)

apt-cache madison worksimple sudo apt install worksimple=<VERSION_BEFORE_1.2.1> sudo apt-mark hold worksimple

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

dnf --showduplicates list worksimple sudo dnf downgrade worksimple-<VERSION_BEFORE_1.2.1> sudo dnf versionlock add worksimple

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: WorkSimple 1.2.1 - Remote File Inclusion / Sensitive Data Disclosure

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-2008-5764?

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

Is CVE-2008-5764 being exploited?

CVE-2008-5764 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-2008-5764 affect?

CVE-2008-5764 affects worksimple. Severity is high (CVSS 9.3). PHP remote file inclusion vulnerability in calendar.php in WorkSimple 1.2.1, when register_globals is enabled, allows remote attackers to execute arbitrary PHP code via a URL in the lang parameter.

How urgent is CVE-2008-5764?

Priority 62/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2008-5765 MEDIUM 5.0 DOWNGRADE WorkSimple 1.2.1 stores sensitive information under the web root with insufficient access control, which allow

References

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