CVE-2026-90448 CISA CVE debrief

Who should care

Defenders and administrators of deployments using the affected application should assess exposure and prioritize verification of deployment mode configuration and API route restrictions.

Why it matters

Defenders should prioritize verifying the deployment mode configuration and restricting request methods for API routes to prevent unauthorized record creation or overwriting, as authenticated users can create or overwrite stored records in a read-only deployment mode.

• Authenticated users can create or overwrite stored records in a read-only deployment mode.
• Elevated backend credentials are used to perform record creation or overwriting.
• Defenders should verify deployment mode configuration and API route restrictions to prevent unauthorized record creation or overwriting.

Technical summary

The vulnerability allows an authenticated user on a deployment intended to be read-only to forge or overwrite stored records that should not be modifiable in that deployment mode. This occurs because a deployment mode intended to expose only read access to stored data proxies a set of application programming interface routes without restricting which request methods are allowed. One such route accepts a request that creates or overwrites a stored record, including an attacker-chosen identifier, using the application's own elevated backend credentials. Defenders should prioritize verifying the deployment mode configuration and restricting request methods for API routes to prevent unauthorized record creation or

Defensive priority

Defenders should prioritize verifying the deployment mode configuration and restricting request methods for API routes to prevent unauthorized record creation or overwriting.

Recommended defensive actions

• Verify deployment mode configuration to ensure read-only access is properly restricted.
• Restrict request methods for API routes to prevent unauthorized record creation or overwriting.
• Monitor for suspicious record creation or modification activity.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability. However, the scope of affected deployments and versions is not specified. Defenders should verify the deployment mode configuration and restrict request methods for API routes to prevent unauthorized record creation or overwriting. Evidence from the CVE record and NVD detail page indicates that authenticated users can create or overwrite stored records in a read-only deployment mode. Further verification is needed to determine the extent of the

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.