CVE-2011-4921
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 · uneditedSQL injection vulnerability in usersettings.php in e107 0.7.26, and possibly other versions before 1.0.0, allows remote attackers to execute arbitrary SQL commands via the username parameter.
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 · high confidenceSQL injection vulnerability in usersettings.php in e107 CMS versions 0.7.26 and earlier (before 1.0.0), where the username parameter is not properly sanitized before being used in SQL queries, allowing remote attackers to inject and execute arbitrary SQL commands.
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= 0.7.26CVSS 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
- High
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:H/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 checksWork through these to decide whether this CVE applies to you.
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Identify e107 installation versionCheck the version.php file in the e107 root directory, or look for a version marker in the admin dashboard under System > Info. Common paths include /e107_handlers/version.php or check the e107_config.php for a version number.Affected if The installed version is 0.7.26 or any version number lower than 1.0.0 (e.g., 0.7.25, 0.7.24, 0.7.x series)
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Locate usersettings.php fileNavigate to the e107 root directory and confirm the presence of usersettings.php. This file typically handles user profile settings and is found directly in the main e107 directory.Affected if The file usersettings.php exists in the e107 installation directory
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Verify the username parameter handlingExamine usersettings.php source code and search for the code block handling the username parameter in SQL queries. Look for unsanitized use of $_POST['username'] or $_GET['username'] directly in SQL statements.Affected if The username parameter is used in SQL queries without proper sanitization or parameterized query preparation (the code contains direct string concatenation into SQL statements)
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Confirm user registration or profile update is accessibleVerify that the usersettings.php page is accessible to unauthenticated or low-privilege users. Check if new user registration is enabled or if the profile edit functionality is publicly accessible.Affected if The vulnerable code path can be reached by remote attackers without admin privileges
You are affected if e107 version 0.7.26 or earlier is installed AND usersettings.php contains unsanitized username parameter usage in SQL queries that can be reached by remote users.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade to e107 version 1.0.0 or later which contains the patch. If immediate upgrade is not feasible, apply input sanitization/parameterized queries to the username parameter in usersettings.php.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-4921 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2011-4921 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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