{"id":"CVE-2026-82405","title":"Klever-Go is the Go implementation of the Klever blockchain protocol","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.RecipientA…","severity":"high","cvss":8.7,"cvssVector":"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","cwe":["CWE-863"],"vendor":"klever-io","product":"github.com/klever-io/klever-go","affected":["github.com/klever-io/klever-go <= 1.7.19"],"patched":["github.com/klever-io/klever-go 1.7.20"],"published":"2026-09-23","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:12.153","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82405","references":[{"url":"https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/releases/tag/v1.7.20","label":"security-advisories@github.com"},{"url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-97cv-x867-6xhm"},{"url":"https://github.com/klever-io/klever-go"}],"tags":["nvd","ghsa","go","cve.org","osv"],"aliases":["GHSA-97cv-x867-6xhm"],"ecosystem":"go","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-24T14:03:22.911530Z"},"cvssSource":"cna","ingestedAt":"2026-09-23T19:31:04.479Z","slug":"CVE-2026-82405","body":"## Overview\n\nKlever-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-82405)\n\nAffected packages:\n\n- `github.com/klever-io/klever-go <= 1.7.19`\n\nPatched in:\n\n- `github.com/klever-io/klever-go 1.7.20`\n\nSource: https://github.com/advisories/GHSA-97cv-x867-6xhm","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}