CVE-2026-11904: 
IBM Security Verify Access (formerly ISAM) vulnerability analysis and mitigation

CVE-2026-11904 is an information disclosure vulnerability affecting IBM Verify Identity Access and IBM Security Verify Access products, classified under CWE-209 (Generation of Error Message Containing Sensitive Information). A remote, unauthenticated attacker can trigger detailed technical error messages returned in the browser, potentially exposing sensitive system information that could facilitate further attacks. Affected products and versions include IBM Verify Identity Access 11.0–11.0.2, IBM Security Verify Access 10.0–10.0.9.1, IBM Verify Identity Access Container 11.0–11.0.2, and IBM Security Verify Access Container 10.0–10.0.9.1. The vulnerability was published on July 30, 2026, with an IBM advisory dated July 8, 2026. It carries a CVSS v3.1 base score of 5.3 (Medium) (IBM Advisory, GitHub Advisory).

The root cause is classified as CWE-209 — the application generates error messages that include sensitive technical details about its internal environment, configuration, or data, which are then returned to the browser. An unauthenticated remote attacker can exploit this by sending crafted or malformed requests to the affected IBM Verify Identity Access or Security Verify Access endpoints, causing the application to return verbose error responses. No authentication, user interaction, or elevated privileges are required, and the attack complexity is low. The disclosed information could be leveraged to map the application's internal structure, identify further attack surfaces, or support follow-on exploitation (IBM Advisory, GitHub Advisory).

Successful exploitation results in partial confidentiality loss — an attacker can obtain sensitive technical information such as stack traces, internal paths, configuration details, or environment data exposed through error messages. There is no direct integrity or availability impact. While the immediate impact is limited, the disclosed information can be used to plan and execute more targeted attacks against the affected identity and access management infrastructure, potentially enabling privilege escalation or lateral movement in subsequent attack stages (IBM Advisory, GitHub Advisory).

No public proof-of-concept exploit code or active in-the-wild exploitation has been reported for CVE-2026-11904. The EPSS score is approximately 0.293% (22nd percentile), indicating a low probability of exploitation within 30 days. The NVD SSVC assessment notes the vulnerability is automatable (no human interaction required) but with only partial technical impact. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog (GitHub Advisory, IBM Advisory).

1. Reconnaissance: Identify internet-facing IBM Verify Identity Access or IBM Security Verify Access instances (versions 10.0–10.0.9.1 or 11.0–11.0.2) using tools such as Shodan or Censys, targeting known IBM ISVA/IVIA login or API endpoints.
2. Trigger error conditions: Send malformed, unexpected, or boundary-case HTTP requests (e.g., invalid parameters, unsupported methods, or malformed authentication tokens) to application endpoints to provoke error responses.
3. Capture verbose error messages: Observe the HTTP response body in the browser or via a proxy tool (e.g., Burp Suite) for detailed technical error messages containing stack traces, internal file paths, software versions, or configuration details.
4. Leverage disclosed information: Use the gathered technical details to identify software components, internal architecture, or potential attack vectors for follow-on exploitation such as targeted injection attacks or privilege escalation (IBM Advisory).

• Network: Unusual volume of HTTP requests with malformed parameters, invalid authentication tokens, or unsupported methods targeting IBM Verify Identity Access or Security Verify Access endpoints from a single or small set of external IP addresses.
• Logs: Application or web server logs showing repeated HTTP 4xx/5xx error responses to the same source IP, particularly for endpoints that do not normally generate errors; log entries containing stack trace output or verbose error details.
• Application Behavior: Error responses returned to clients containing internal path information, Java stack traces, or configuration data that should not be exposed externally.

IBM has released patches addressing this vulnerability; organizations should upgrade to a fixed version as recommended in the IBM security advisory (node/7279510). As a general workaround, administrators should configure the application to suppress detailed technical error messages from being returned to end users, replacing them with generic error pages. Network-level controls such as web application firewalls (WAFs) can be configured to detect and block responses containing stack traces or verbose error content. Review and apply IBM's guidance at the official advisory page (IBM Advisory).