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FlashchatApplication · Darrens 5 Dollar Script Archive

CVE-2007-0834

MEDIUM · 6.8 CVSS v2.0 Published 2007-02-07
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
77/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Cross-site scripting (XSS) vulnerability in FlashChat 4.7.8 allows remote attackers to inject arbitrary web script or HTML via the user name field when the user joins a chat room, a different vulnerability than CVE-2007-0807. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Cross-site scripting (XSS) vulnerability in FlashChat 4.7.8 allows remote attackers to inject arbitrary JavaScript or HTML through the user name field when a user joins a chat room. The unsanitized user input is reflected back to other users without proper output encoding, allowing script execution in the context of other users' browsers.

MitigationImplement proper input validation and output encoding for the username field. Specifically, sanitize special HTML characters before reflecting user input in the chat interface, and consider implementing Content-Security-Policy headers to mitigate XSS execution.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FlashchatApplication
Affected:= 4.7.8

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
M
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify FlashChat installation and version
    Check your web server for the FlashChat installation directory. Look for version information in the software's about page, footer, or version file. Common paths include /flashchat/, /chat/, or directories containing 'flashchat' in the name. Check any readme, version.txt, or config files for the exact version number.
    Affected if The installed version is exactly FlashChat 4.7.8 from Darrens 5 Dollar Script Archive
  2. Verify the chat room join functionality is accessible
    Navigate to the FlashChat login or join page in a web browser. This is typically the entry point where users enter their username before entering a chat room. Confirm the application is actively serving pages.
    Affected if The FlashChat 4.7.8 login/join interface is accessible and operational on the network
  3. Confirm username field accepts user input
    Access the chat room entry page where the username field is presented. Enter a test string such as 'TestUser' in the username field and observe whether the application accepts and reflects this input back.
    Affected if The username field accepts arbitrary text input and reflects it in the response without validation messages blocking it
  4. Verify lack of output encoding in chat display
    After entering a username and joining a chat room, view the page source or observe if your entered username appears unencoded in the chat interface or user list. Use browser developer tools to inspect the HTML context of the displayed username.
    Affected if The username appears in the HTML output exactly as entered, without HTML entity encoding (e.g., < appears as < not as &lt;)

A user is affected if FlashChat version 4.7.8 is installed and running, and the username field in the chat join interface accepts and reflects unencoded user input back to other users in the chat room.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper input validation and output encoding for the username field. Specifically, sanitize special HTML characters before reflecting user input in the chat interface, and consider implementing Content-Security-Policy headers to mitigate XSS execution.

Fix this in Flashchat Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2007-0834 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data