CVE-2026-45695
CRITICALKopia: Unauthenticated RCE via SSH ProxyCommand Injection when --insecure --without-password is used
Title source: cnaDescription
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=<cmd> can cause exec.CommandContext("ssh") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/kopia/kopia/security/advisories/GHSA-2q4c-3mrw-63c3
X_Refsource_Misc x_refsource_misc
https://github.com/kopia/kopia/pull/5354
X_Refsource_Misc x_refsource_misc
https://github.com/kopia/kopia/commit/c26c6a1b9734c5089217986ffa5cd19f8a6b8900
X_Refsource_Misc x_refsource_misc
https://github.com/kopia/kopia/releases/tag/v0.23.0
Scores
CVSS v3
9.8
EPSS
0.0035
EPSS Percentile
27.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-306
CWE-78
Status
published
Products (1)
kopia/kopia
< 0.23.0
Published
Jul 16, 2026
Tracked Since
Jul 16, 2026