Medium [CVE-2026-45695] Arbitrary code execution via unauthenticated SFTP configuration in HTTP server.
This medium-severity Red Hat Linux advisory covers CVE-2026-45695 affecting Migration Toolkit for Containers, OpenShift API for Data Protection.
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Summary
Kopia is a cross-platform backup tool for Windows, macOS, and Linux with fast incremental backups, client-side end-to-end encryption, compression, and data deduplication.
Prior to 0.23.0, Kopia's HTTP server started with --without-password accepts unauthenticated requests to /api/v1/repo/exists and forwards attacker-supplied SFTP storage configuration to blob. NewStorage, where externalSSH: true and sshArguments containing -oProxyCommand= can cause exec.
CommandContext("ssh") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0.
This allows the attacker to forward malicious SFTP storage configurations, which can lead to arbitrary code execution through OpenSSH commands. Red Hat Product Security considers this bug as Moderate as this requires active change of out of box configaration for this bug to be exploitable.
There is no common use case under which Kopia HTTP server should be started without a password. The diecrepancy in CVSS scores between Red Hat and NVD comes from the differences in User Interaction, Integrity and Availability.
The core bug is merely an unintended information disclosure problem if exploited correctly. There is no way to launch a denial of service or affect the integrity of the service.
Therefore the bug is scored lower. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).
Weakness: CWE-78.
- < 0.23.0
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation checklist
- This bug can be rendered unusable by making sure that --without-password is not included in startup options for Kopia HTTP server.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
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