CISA Malcolm up to 26.5.x Reverse Proxy access control

Summaryinfo

A vulnerability has been found in CISA Malcolm up to 26.5.x and classified as very critical. This impacts an unknown function of the component Reverse Proxy. Performing a manipulation results in access control. This vulnerability is identified as CVE-2026-90449. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical has been found in CISA Malcolm up to 26.5.x. This affects an unknown part of the component Reverse Proxy. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

When a particular authentication mode is configured, the reverse proxy forwards requests for a bundled third-party administrative interface directly to that interface without applying the gateway's own authentication requirement first. All access control for this administrative interface, which manages the credential store used to gate every other service in the deployment, is delegated entirely to that third-party interface's own login mechanism. Any authentication weakness in that bundled interface would compromise the credential store protecting the rest of the deployment.

The advisory is shared at raw.githubusercontent.com. This vulnerability is uniquely identified as CVE-2026-90449 since 09/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD at the moment (estimation calculated on 09/12/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 26.06.0 eliminates this vulnerability.

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Productinfo

Vendor

• CISA

Name

• Malcolm

Version

• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5

CPE 2.3info

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CPE 2.2info

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