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  <a class="back" href="/security-research-notebook/">&larr; Research notebook</a>
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  <div class="kicker">Info disclosure</div>
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  <h1>Project Name Enumeration</h1>
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<section><div class="wrap"><div class="content">
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<h1>SUBMISSION 1</h1>
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<p>TITLE: Project Name Enumeration via 403/404 Response Differentiation Leaks Customer List</p>
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<p>TARGET: api.aiven.io (https://api.aiven.io/login)</p>
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<p>VRT CATEGORY: Server Security Misconfiguration &gt; Information Disclosure</p>
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<p>URL: https://api.aiven.io/v1/project/{project_name}</p>
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<h2>DESCRIPTION:</h2>
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<h2>Summary</h2>
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<p>The <code>GET /v1/project/{project_name}</code> endpoint returns differentiated HTTP responses for existing vs non-existing projects, allowing any authenticated user to enumerate all project names on the Aiven platform. Since project names frequently match company or organization names, this directly reveals Aiven&rsquo;s customer list.</p>
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<ul>
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<li>Existing project (not owned by requester): <strong>403</strong>, <code>"Not a project member"</code></li>
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<li>Non-existing project: <strong>404</strong>, <code>"Project does not exist"</code></li>
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</ul>
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<h2>Steps to Reproduce</h2>
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<ol>
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<li>
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<p>Authenticate to the Aiven API with any valid token.</p>
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</li>
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<li>
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<p>Query existing project name:</p>
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</li>
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</ol>
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<pre><code class="language-bash">curl -s https://api.aiven.io/v1/project/netflix \
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  -H &quot;Authorization: aivenv1 &lt;TOKEN&gt;&quot;
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</code></pre>
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<p><strong>Response (403):</strong></p>
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<pre><code class="language-json">{&quot;errors&quot;:[{&quot;message&quot;:&quot;Not a project member&quot;,&quot;status&quot;:403}]}
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</code></pre>
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<ol start="3">
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<li>Query non-existing project name:</li>
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</ol>
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<pre><code class="language-bash">curl -s https://api.aiven.io/v1/project/doesnotexist12345xyz \
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  -H &quot;Authorization: aivenv1 &lt;TOKEN&gt;&quot;
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</code></pre>
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<p><strong>Response (404):</strong></p>
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<pre><code class="language-json">{&quot;errors&quot;:[{&quot;message&quot;:&quot;Project does not exist&quot;,&quot;status&quot;:404}]}
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</code></pre>
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<ol start="4">
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<li>The 403/404 differentiation confirms whether a project name exists on the platform.</li>
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</ol>
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<h2>Confirmed Existing Projects</h2>
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<table>
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<thead>
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<tr>
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<th>Project Name</th>
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<th>HTTP Status</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>netflix</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>spotify</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>google</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>facebook</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>tesla</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>databricks</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>redis</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>grafana</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>production</code></td>
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<td>403 (exists)</td>
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</tr>
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<tr>
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<td><code>internal</code></td>
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<td>403 (exists)</td>
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</tr>
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</tbody>
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</table>
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<p>Controls: <code>doesnotexist12345xyz</code>, <code>another-fake-project-abc</code> → 404.</p>
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<h2>Impact</h2>
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<p>An attacker can enumerate Aiven&rsquo;s customer base by iterating company names against this endpoint. This reveals which organizations use Aiven for their database infrastructure, commercially sensitive information that enables competitive intelligence gathering and targeted supply chain attacks against confirmed Aiven customers.</p>
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<h2>Suggested Fix</h2>
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<p>Return a uniform <code>404 "Project does not exist"</code> for both non-existing projects and projects the requester doesn&rsquo;t have access to.</p>
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<hr><p style="color:var(--faint);font-size:12.5px;font-family:ui-monospace,Menlo,monospace">Source &middot; github.com/zionboggan/security-research-notebook &middot; writeups/aiven/project-name-enumeration.md</p>
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  <div class="note">Coordinated-disclosure research. Findings appear here only after the program's disclosure window closed, the patch shipped, or a CVE was published. No customer data was accessed.</div>
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