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IBM Security Verify Access 10.0 through 10.0.9.2, IBM Verify Identity Access 11.0 through 11.0.3, and IBM Verify Identity Access Container 11.0 through 11.0.3 contain a vulnerability in the Reverse Proxy component. Under certain configurations, the Reverse Proxy performs weaker than expected cryptographic validation of user-supplied data. This flaw is rooted in improper authentication mechanisms (CWE-287), where the affected products fail to adequately verify the integrity and authenticity of cryptographic tokens, cookies, or signed requests passed through the proxy.
The Reverse Proxy is designed to offload SSL/TLS termination, enforce access policies, and validate security tokens before forwarding requests to backend applications. In vulnerable configurations, the proxy accepts cryptographically signed data—such as SAML assertions, OAuth tokens, or JWT cookies—without rigorously checking the signature algorithm, key strength, or expiration boundaries. An attacker can craft a malicious request with a tampered cryptographic payload that bypasses the proxy’s validation logic. Because the proxy trusts this data, it forwards the request to the backend with elevated privileges or as a different user.
This vulnerability is exploitable over the network without authentication (AV:N/AC:H/PR:N/UI:N). The attack complexity is high because the attacker must understand the specific cryptographic implementation and craft a payload that passes the weakened checks. Once exploited, the attacker can achieve high impact on confidentiality and integrity (C:H/I:H)—reading sensitive data, modifying application state, or impersonating legitimate users. The vulnerability does not affect availability (A:N). IBM has assigned a CVSS v3.1 base score of 7.4 (High). The NVD published this CVE on August 12, 2026, and last modified it on August 13, 2026.
DailyCVE Form:
Platform: IBM Security Verify Access
Version: 10.0–10.0.9.2 / 11.0–11.0.3
Vulnerability: Weak cryptographic validation
Severity: High (7.4 CVSS)
date: August 12, 2026
Prediction: September 2026
What Undercode Say:
Check IBM Security Verify Access version
/opt/ibm/security_verify_access/bin/version.sh
Check Reverse Proxy cryptographic settings
grep -r "signatureAlgorithm" /opt/ibm/security_verify_access/config/
Verify if weak ciphers are enabled in SSL configuration
openssl ciphers -v 'ALL:!aNULL' | grep -E "RC4|MD5|DES"
Test for vulnerable JWT validation (educational)
Decode JWT token without verifying signature
echo "eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJ1c2VyIjoiYWRtaW4ifQ." | base64 -d
Check for hardcoded or weak cryptographic keys in configuration
find /opt/ibm/ -name ".xml" -exec grep -l "keyStore" {} \;
Exploit: (Educational Purposes!)
An attacker can intercept a legitimate signed request or token passed through the Reverse Proxy. By modifying the payload and either removing the signature check or using a weak algorithm (e.g., “none” algorithm in JWT), the attacker can craft a request that the proxy accepts as valid. The proxy forwards this tampered request to the backend application with the attacker’s forged identity or privileges. For example, a JWT token with the “none” algorithm and an altered “sub” claim can be used to impersonate an administrator. The proxy, failing to enforce proper cryptographic validation, does not reject the token.
Protection:
- Upgrade to IBM Security Verify Access 10.0.9.2 with interim fix or later versions once IBM releases the official patch.
- Review Reverse Proxy cryptographic validation settings and enforce strict signature verification for all tokens.
- Disable weak cryptographic algorithms (e.g., “none”, HS256 with weak keys) in the proxy configuration.
- Monitor Reverse Proxy logs for anomalous requests with malformed or tampered cryptographic tokens.
- Apply network segmentation to limit exposure of the Reverse Proxy to untrusted networks.
Impact:
Successful exploitation allows a remote, unauthenticated attacker to bypass cryptographic validation in the Reverse Proxy. This leads to unauthorized access to backend applications, data disclosure (confidentiality impact), and data tampering (integrity impact). The attacker can impersonate legitimate users, including administrators, and perform actions with elevated privileges. Organizations using affected versions in exposed configurations face significant risk of data breach and system compromise.
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Sources:
Reported By: nvd.nist.gov
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