CVE-2007-1394: Direct static code injection vulnerability in startsession.php in Flat Chat 2.0 allows remote attackers to exe

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HIGH 10.0DOWNGRADE

CVE-2007-1394 is a high-severity flaw (CVSS 10.0) affecting flat chat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Direct static code injection vulnerability in startsession.php in Flat Chat 2.0 allows remote attackers to execute arbitrary PHP code via the Chat Name field, which is inserted into online.txt and included by users.php. NOTE: some of these details are obtained from third party information.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Published	2007-03-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: flat chat

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

Am I affected?

Timeline

2007-03-10 22:19 UTCPublished CVE record published
2026-06-16 22:37 UTCUpdated Record last modified

flat chat flat chat DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy flat-chat || rpm -q flat-chat || flat-chat --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison flat-chat sudo apt install flat-chat=<VERSION_BEFORE_2.0> sudo apt-mark hold flat-chat

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

dnf --showduplicates list flat-chat sudo dnf downgrade flat-chat-<VERSION_BEFORE_2.0> sudo dnf versionlock add flat-chat

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: Flat Chat 2.0 - 'include online.txt' 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-2007-1394?

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

Is CVE-2007-1394 being exploited?

CVE-2007-1394 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-2007-1394 affect?

CVE-2007-1394 affects flat chat. Severity is high (CVSS 10.0). Direct static code injection vulnerability in startsession.php in Flat Chat 2.0 allows remote attackers to execute arbitrary PHP code via the Chat Name field, which is inserted into online.txt and included by users.php. NOTE: some of these

How urgent is CVE-2007-1394?

Priority 63/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

References

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