---
cve: "CVE-2026-82405"
severity: "HIGH"
cvss: 8.7
epss: "26.3%"
vendor: "klever-io"
kev: false
exploited: false
published: "2026-09-23 20:17:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T10:27:28+02:00"
---

# CVE-2026-82405

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 0b70b0f1a1f5d95ac07c2038c227db7f18976a2a (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-82405) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_