CVE-2026-90457 CISA CVE debrief

Who should care

Local system administrators and security teams responsible for managing administrative credentials and ensuring secure password storage practices should prioritize verification and remediation of weak password hashing to prevent potential credential compromise.

Why it matters

CVE-2026-90457 highlights a medium-severity vulnerability in the use of a comparatively weak administrative password hashing algorithm, allowing potential recovery of credentials by local users or those with access to configuration backups.

• Potential recovery of administrative credentials by local users or parties with configuration backup access
• Compromise of administrative credentials across multiple authentication paths
• Need for verification of weak password hashing in local system configurations
• Priority for remediation to prevent potential credential compromise

Technical summary

The administrative password is hashed using a comparatively weak algorithm and stored in a file readable by any local user, allowing potential recovery of the underlying password through offline computation. This is inconsistent with a separate, stronger hashing algorithm used for the same password on another authentication path, which could compromise the administrative credential across every path that accepts it if the weaker-hashed password is recovered offline by a party able to read the file containing the hash.

Defensive priority

High priority for local system administrators and security teams to verify and remediate weak password hashing

Recommended defensive actions

• Verify local system configurations for weak password hashing
• Remediate weak password hashing for administrative credentials
• Restrict access to configuration backups and sensitive files
• 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 description notes an administrative password is hashed using a comparatively weak algorithm and stored in a file readable by any local user, inconsistent with another authentication path's stronger hashing algorithm. The weak hashing algorithm used for one authentication path could allow a party able to read the file containing the hash to feasibly recover the underlying password through offline computation.

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.