Unauthorized command execution via discarded SSH permissions
Published May 22, 2026 · Updated Aug 28, 2026
Authorization bypass in golang.org/x/crypto/ssh before 0.52.0 allows remote authenticated users to execute unauthorized SSH commands. NewServerConn discarded non-nil Permissions returned with PartialSuccessError, so restrictions such as force-command vanished before later authentication succeeded. Exploitation requires an SSH server that combines certificate restrictions with multi-factor callbacks; the bypass grants command access outside the certificate's policy.
Summary
What happened
Authorization bypass in golang.org/x/crypto/ssh before 0.52.0 allows remote authenticated users to execute unauthorized SSH commands. NewServerConn discarded non-nil Permissions returned with PartialSuccessError, so restrictions such as force-command vanished before later authentication succeeded. Exploitation requires an SSH server that combines certificate restrictions with multi-factor callbacks; the bypass grants command access outside the certificate's policy.
The record
- CVE
- CVE-2026-39828
- Published
- May 22, 2026
- Updated
- Aug 28, 2026
- Vendor
- 389 Directory Server
- Product
- Assisted Installer for OpenShift Container Platform
- Classifications
- CWE-281, CWE-295, T1021.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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