CVE-2026-74881 jahlives CVE debrief

Who should care

Defenders responsible for API security, particularly those using openssl_encrypt versions before 1.4.0, should assess their exposure and verify their API configurations to protect against unauthorized cross-origin requests.

Why it matters

The CVE-2026-74881 vulnerability in openssl_encrypt versions before 1.4.0 could allow attackers to make authenticated cross-origin requests to the API on behalf of any user who visits a malicious website. Defenders should prioritize verification of API configurations and consider updating to version 1.4.0 or later.

• Defenders need to verify API configurations to prevent unauthorized cross-origin requests.
• Security teams should update openssl_encrypt to version 1.4.0 or later to resolve the CORS misconfiguration.
• Monitoring API logs for suspicious cross-origin requests can help detect potential attacks.
• Implementing additional security measures, such as token-based authentication, can protect against unauthorized requests.

Technical summary

The openssl_encrypt library versions before 1.4.0 have a CORS misconfiguration vulnerability. The library configures CORS with allow_origins set to wildcard and allow_credentials enabled to true. This could potentially allow attackers to create malicious websites that make authenticated cross-origin requests to the API on behalf of any user who visits them. The vulnerability affects API security, particularly for defenders using openssl_encrypt versions before 1.4.0. To mitigate this vulnerability, defenders should prioritize verification of API configurations and consider updating to version 1.4.0 or later.

Defensive priority

Defenders should prioritize verification of API configurations, especially those using openssl_encrypt versions before 1.4.0, to ensure proper CORS settings and protect against unauthorized cross-origin requests.

Recommended defensive actions

• Verify API configurations, especially those using openssl_encrypt versions before 1.4.0, to ensure proper CORS settings.
• Update openssl_encrypt to version 1.4.0 or later to resolve the CORS misconfiguration.
• Monitor API logs for suspicious cross-origin requests.
• Implement additional security measures, such as token-based authentication, to protect against unauthorized requests.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in openssl_encrypt versions before 1.4.0, which configures CORS with allow_origins set to wildcard and allow_credentials enabled to true, potentially allowing malicious websites to make authenticated cross-origin requests.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.