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CVE-2026-82405: Product identification pending

Severity

8.7 (HIGH)

Affected versions

Before 1.7.20

Fixed version

1.7.20.

Patch status

Patched

Published

2026-09-23T20:17:16.370

Modified

2026-09-23T20:17:16.500

Why it matters

High-severity vulnerability requiring prioritized review.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Compare installed versions against the affected version range in the advisory.

Technical summary

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.

View the official NVD record for CVE-2026-82405

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.