Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

CVE-2026-82405Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-controlled `RecipientAddr` instead of the authenticated caller

High 8.7

In plain English

A high-severity incorrect authorization in klever-go from klever-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.4%top 62.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/klever-io/klever-go	1.7.20	GHSA-97cv-x867-6xhm
Go	github.com/klever-io/klever-go	1.7.20	GO-2026-6582

Affected products (as reported)

Vendor	Product	Versions
klever-io	klever-go	< 1.7.20

Weakness: CWE-863 · Vector: 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

References

https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm x_refsource_CONFIRM
https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32 x_refsource_MISC
https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9 x_refsource_MISC
https://github.com/klever-io/klever-go/releases/tag/v1.7.20 x_refsource_MISC