Authenticated authorization bypass via incorrect identity binding
Published Sep 11, 2026 · Updated Sep 11, 2026
Incorrect access control in strongSwan 4.5.0 through 6.0.7 allows remote authenticated users to impersonate other VPN users. The eap-peap and eap-ttls plugins omit or mismatch inner EAP authentication details when binding the authenticated identity to the IKE SA. Valid credentials and an affected tunneled EAP configuration are required; successful exploitation can select another user's policy or virtual IP.
Summary
What happened
Incorrect access control in strongSwan 4.5.0 through 6.0.7 allows remote authenticated users to impersonate other VPN users. The eap-peap and eap-ttls plugins omit or mismatch inner EAP authentication details when binding the authenticated identity to the IKE SA. Valid credentials and an affected tunneled EAP configuration are required; successful exploitation can select another user's policy or virtual IP.
The record
- CVE
- CVE-2026-78134
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- strongSwan
- Product
- strongSwan
- Classifications
- T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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?
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- Affected versionversion=4.5.0 <6.1.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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