CVE-2026-53812: OpenClaw Server-Side Request Forgery (SSRF) in Browser Control

Technical summary

CVE-2026-53812 is an SSRF vulnerability in OpenClaw's browser control subsystem that improperly validates Playwright action interactions. Authenticated users can exploit action-triggered redirects to navigate to private-network targets that should be blocked by internal navigation checks. Once access to a restricted target is gained, browser evaluation capabilities allow an attacker to read and extract page content from those internal resources. The vulnerability stems from insufficient validation of redirect destinations in the context of Playwright-based browser automation, enabling circumvention of network-boundary controls.

Business impact

This vulnerability could lead to unauthorized disclosure of sensitive internal data. An insider or compromised user account can use OpenClaw to systematically probe and read content from private-network systems—such as internal administrative interfaces, databases, or microservices—that should be isolated from external access. In environments where OpenClaw is exposed to multiple users or federated authentication, the blast radius increases. Organizations relying on network segmentation as a primary control will find that control partially weakened if OpenClaw is positioned as a bridge to internal resources.

Affected systems

OpenClaw versions prior to 2026.5.18 are affected. Organizations running any version of OpenClaw before the patched release should assume exposure. The vulnerability is triggered through authenticated access, so only deployments permitting user authentication present active risk. Cloud or multi-tenant deployments where OpenClaw serves multiple customer organizations carry elevated impact.

Exploitability

Exploitation requires valid authentication credentials and network access to the OpenClaw instance; it cannot be exploited unauthenticated. However, the attack is straightforward once credentials are obtained: an attacker simply issues browser-control actions that redirect to private-network targets and evaluates the response. The low attack complexity combined with the ease of chaining actions suggests that any authenticated user with malicious intent or whose account is compromised can readily exploit this. The vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, but the simplicity of the attack mechanism suggests monitoring for active exploitation attempts is warranted.

Remediation

Upgrade OpenClaw to version 2026.5.18 or later. This patched version includes validation improvements to enforce private-network navigation restrictions within Playwright interactions. No workarounds are available; patching is the required mitigation. After patching, verify that browser-control actions targeting internal IPs or private-network hostnames are properly rejected.

Patch guidance

Deploy OpenClaw 2026.5.18 or a later stable release in your environment. Prioritize patching systems in high-trust networks or those with sensitive internal integrations. Test the patch in a non-production environment first to confirm compatibility with existing Playwright-based automation workflows. After deployment, monitor logs for authentication patterns or redirect requests that may indicate prior exploitation attempts. Consider rolling the patch to production within 5–10 business days given the HIGH severity rating and the prevalence of internal-network integrations in typical deployments.

Detection guidance

Look for OpenClaw process logs or browser-control action logs that show requests to private-network IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 127.0.0.0/8) or RFC 1918 addresses. Monitor for unusual redirect chains in browser evaluation results, especially if the initial navigation target differs from the final resource accessed. Check authentication logs for user accounts accessing OpenClaw around the time of suspected exploitation. Network-level detection can observe outbound traffic from OpenClaw instances to unexpected internal systems or ports (e.g., database, admin panels, Kubernetes APIs). Baseline your environment first to identify legitimate internal-network access, then flag deviations.

Why prioritize this

A CVSS 7.7 HIGH score with confidentiality impact and no authentication bypass reflects meaningful but not critical risk. However, the low barrier to exploitation (simple action chaining) combined with the direct threat to internal-system confidentiality warrants prioritization within the HIGH-risk band. Organizations with flat networks, no micro-segmentation, or sensitive data reachable via internal APIs should patch within days. Those with layered defenses and strict access controls can plan patching within 1–2 weeks, but should not delay beyond that window.

Risk score, explained

The CVSS 3.1 score of 7.7 (HIGH) reflects: (1) network-accessible attack vector, (2) low attack complexity—no special conditions required to trigger the vulnerability, (3) low privilege requirement—any authenticated user can exploit, (4) no user interaction needed, (5) changed scope—the vulnerability can affect systems beyond the OpenClaw application itself, and (6) high confidentiality impact—internal data can be read. The score appropriately excludes integrity and availability impact, as this is a read-only SSRF. The vulnerability does not appear in CISA's KEV catalog as of the advisory date, but may be added if active exploitation emerges.

Frequently asked questions