Incorrect authorization in klever-io klever-go
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| klever-io | klever-go | before 1.7.20 | 1.7.20 | Patch available | CNA |
| — | github.com/klever-io/klever-go (Go) | before 1.7.20 | 1.7.20 | Patch available | GHSA-97cv-x867-6xhm |
- klever-go Vendorklever-io Affected before 1.7.20 Fixed in 1.7.20 Patch available CNA
- github.com/klever-io/klever-go (Go) Vendor— Affected before 1.7.20 Fixed in 1.7.20 Patch available GHSA-97cv-x867-6xhm
Remediation
- Fix · CNA klever-go (klever-io) Fixed in 1.7.20
- Fix · GHSA-97cv-x867-6xhm github.com/klever-io/klever-go (Go) Fixed in 1.7.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82405
- 2026-10-03 Alias added: GHSA-97cv-x867-6xhm
- 2026-10-25 Priority changed: LOW → MEDIUM
References
Other 5
- https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm
- https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32
- https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20
- https://github.com/klever-io/klever-go
More klever-io vulnerabilities
- TI-2026-40253 Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply CVSS 4.0HIGH 8.7
- TI-2026-40252 Klever-Go: Percentage-transfer royalty skips the source debit at exactly-100% splits CVSS 4.0HIGH 8.7
- TI-2026-58874 Klever-Go: /log controls global node logging CVSS 3.1HIGH 8.6
- TI-2026-32588 Klever-Go MultiDataInterceptor: remote OOM via crafted compressed P2P payload CVSS 3.1HIGH 8.6
- TI-2026-39560 Integer underflow in klever-io klever-go CVSS 3.1CRITICAL 9.6
- TI-2026-58875 Resource allocation without limits in klever-io klever-go CVSS 3.1HIGH 7.5
Sources
- CVE-2026-82405 · CVE Program
- CVE-2026-82405 · NVD
- FIRST EPSS
- GHSA-97cv-x867-6xhm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences