Klever Go up to 1.7.19 Permission Authorization KleverUpdateAccountPermission vmInput.RecipientAddr/vmInput.CallerAddr improper authorization

Summaryinfo

A vulnerability identified as problematic has been detected in Klever Go up to 1.7.19. This impacts the function KleverUpdateAccountPermission of the component Permission Authorization. The manipulation of the argument vmInput.RecipientAddr/vmInput.CallerAddr leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-82405. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Klever Go up to 1.7.19. This issue affects the function KleverUpdateAccountPermission of the component Permission Authorization. The manipulation of the argument vmInput.RecipientAddr/vmInput.CallerAddr with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is integrity, and availability. The summary by CVE is:

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the KleverUpdateAccountPermission built-in authorizes replacement of a target account's permissions by checking attacker-controlled vmInput.RecipientAddr instead of authenticated vmInput.CallerAddr. An attacker-controlled contract can choose a victim account with configured permissions as RecipientAddr, and contractHasValidPermission can accept the victim's default self-signer as authorization. UpdatePermission can then replace the victim's entire permission set with attacker-supplied Owner permissions, enabling asset theft or permanent lockout without a victim key or signature. Accounts without stored permissions and the native transaction path are not affected. This issue is fixed in version 1.7.20.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-82405 since 08/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.7.20 eliminates this vulnerability.

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Productinfo

Vendor

• Klever

Name

• Go

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14
• 1.7.15
• 1.7.16
• 1.7.17
• 1.7.18
• 1.7.19

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