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Anthropic’s Claude Code Desktop was vulnerable to an exploit chain that could execute attacker-controlled JavaScript in its automatic HTML preview and silently exfiltrate credentials. A poisoned public repository only needed a specially prepared HTML file; after a developer asked Claude Code to review or edit it, the preview rendered automatically, requiring no additional click or approval. Noma Security rated the chain CVSS 8.7 (High), and said Anthropic’s final fix was verified and deployed on August 17, 2026.
What the SneakPeek flaw was
SneakPeek was not a bug in a normal web browser. It was an exploit chain in Claude Code Desktop’s built-in preview pane, an Electron/Chromium panel that displays HTML files generated or modified by Claude. The pane was intended to make code-work results easy to inspect, but its rendering behavior created a path from an untrusted repository to the developer’s local environment.
An attacker could publish an ordinary-looking code repository containing an HTML file padded beyond 256 KB and embed a malicious script in that file. When a developer used Claude Code to review or edit the file, the application automatically opened it in the preview pane. The script could then make requests and transmit locally readable secrets without a separate prompt, click or other deliberate interaction.
The attack still depended on a developer bringing the repository into Claude Code and requesting work on the file. “Zero-click” describes what happened after that trigger: the preview’s automatic rendering removed the final approval step that a user might otherwise notice.
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How the attack chain bypassed the preview’s protections
Dark Reading’s coverage identified three architectural gaps that worked together rather than a single isolated rendering error:
- No effective content security policy: the preview did not impose a restrictive policy that would have blocked or constrained the embedded script.
- Unrestricted origin access: the rendered document could interact with origins more broadly than a safely isolated preview should allow.
- Inactive request filtering: a protection intended to restrict outbound requests was not active, allowing the script to send data to an attacker-controlled destination.
Electron and Chromium can provide useful isolation primitives, but those primitives only help when the application configures them correctly and keeps every layer enabled. In SneakPeek, the missing policy, permissive origin behavior and inactive filtering combined to defeat the preview’s intended sandbox boundaries.
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The practical sequence
- An attacker adds a malicious, oversized HTML file to a public repository.
- A developer clones or opens that repository in Claude Code Desktop.
- The developer asks Claude Code to review or edit the file.
- The application automatically renders the file in its preview pane.
- Embedded JavaScript runs in the preview context and sends accessible secrets outward.
The 256 KB threshold is a condition reported for the exploit technique, not a recommendation to treat smaller HTML files as safe. Any automatically rendered, untrusted HTML remains an attack surface.
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Noma Security and Dark Reading reported that the exposed material could include credentials and configuration files readable by the local user account:
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| Potentially exposed material | Why it matters |
|---|---|
| SSH private keys | Could enable access to source repositories, servers or developer infrastructure. |
| AWS and other cloud credentials | Could provide a route into cloud accounts, workloads and stored data, depending on permissions. |
| GitHub credentials | Could enable repository access, code changes or token abuse. |
| API keys | Could authorize calls to third-party services or incur usage and data-exposure risk. |
| Kubernetes configuration | Could expose cluster endpoints and authentication material. |
| Claude OAuth tokens | Could allow abuse of the associated account or session, subject to token scope and validity. |
The danger is therefore broader than one copied file. A stolen key can become a downstream path into source control, cloud infrastructure or development environments, and the eventual impact depends on the permissions and lifetime of each credential.
Severity, disclosure and patch timeline
Noma Security assigned the exploit chain a CVSS score of 8.7, classified as High. Senior AI vulnerability researcher Eli Ainhorn described the scenario as a public repository containing an HTML file padded past 256 KB with an embedded malicious script.
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| Date | Event |
|---|---|
| August 17, 2026 | Noma said Anthropic’s final security patch had been verified and deployed after coordinated disclosure. |
| October 14, 2026 | Dark Reading and Noma publicly reported the SneakPeek exploit chain. |
Noma also reported that an earlier fix was bypassed by the discovering researchers. Anthropic then made deeper architectural changes before the final remediation. That history matters: installing an initial update was not necessarily equivalent to receiving the complete fix.
Was SneakPeek patched?
The available public account says the final patch was deployed on August 17, 2026. Because that is a historical deployment date and Claude Code Desktop builds can change, organizations should verify the exact version installed on every workstation and check Anthropic’s current security advisory before treating systems as remediated. The reported date alone does not prove that an unverified or unmanaged installation is protected.
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What to do if you opened a poisoned repository
Treat a suspected preview exposure as a credential incident, even if you saw no warning and cannot confirm that data left the machine.
- Isolate the workstation’s developer sessions. Stop active Claude Code, source-control and cloud sessions while preserving the information your incident team needs.
- Rotate potentially readable secrets. Revoke and replace SSH keys, cloud access keys, source-control tokens, API keys, Kubernetes credentials and Claude OAuth tokens that were present or accessible to the local account.
- Review logs for misuse. Check source-control audit events, cloud sign-ins and API activity for new locations, unusual times, unexpected repository changes, privilege escalation or unfamiliar outbound use.
- Inspect the repository and preview activity. Record the repository URL, commit or branch, HTML filename and the time the file was opened. Do not execute the file again while collecting evidence.
- Confirm the application update. Verify the installed Claude Code Desktop build against Anthropic’s current advisory and your organization’s approved software inventory.
- Contain follow-on access. Revoke sessions, remove unauthorized keys, check CI/CD and container credentials, and investigate any cloud or source-control account reached by the exposed material.
Secret rotation should be prioritized by privilege: production cloud keys, administrator tokens and repository write credentials generally warrant immediate action, followed by lower-privilege or short-lived secrets. Log review can reveal abuse that a local antivirus alert would not.
What developers and security teams should change
- Do not assume that a code-review tool’s preview is equivalent to viewing inert text. Automatically rendered HTML, SVG and other active formats deserve browser-level threat modeling.
- Use least-privilege credentials and short-lived tokens on developer workstations so a preview compromise cannot expose an entire environment.
- Keep endpoint detection, outbound-request monitoring and developer secret scanning enabled, with workflows for rapid revocation.
- Monitor cloud and source-control identity activity for unusual token use after opening unfamiliar repositories.
- Prefer reviewing untrusted files as text or in a separately isolated environment when the application’s rendering behavior is uncertain.
SneakPeek demonstrates why “the application is sandboxed” is not a sufficient security conclusion. Isolation depends on correctly enforced content policies, origin boundaries and network controls, and one disabled layer can turn an automatic convenience feature into a credential-exfiltration path.
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