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

Type: advisorySource: OSV1 source record

### Description The VM built-in function `KleverUpdateAccountPermission` (registered always-active, `creator.go:381-390` / `core/vmconstants.go:234`) rewrites an account's entire permission set. Its authorization check uses `vmInput.RecipientAddr` **attacker-controlled** instead of the authenticated `vmInput.CallerAddr`. The sibling handler `kleverChangeOwnerAddress.go:86` uses `vmInput.CallerAddr` correctly, so the safe pattern exists in-repo; this handler deviates. The native transaction path (`txProcess.go:833`) is safe it uses `tx.GetSender()`. Mechanism: 1. **Wrong variable:** `CallerAddr` is never referenced in the handler; auth is `contractHasValidPermission(target.GetPermissions(), RecipientAddr)`, which returns true if `RecipientAddr` is a signer with `Weight >= Threshold` in the *target* account's permissions and the permission grants `UpdateAccountPermissionContractType`. 2. **RecipientAddr is attacker-controlled:** when a contract calls a built-in via `ExecuteOnDestContextWithTypedArgs` (`baseOps.go:1967`), `prepareIndirectContractCallInput` (`baseOps.go:2485`) sets `RecipientAddr = destination` (contract-chosen) and `CallerAddr = the calling contract`. The blockchain hook (`blockChainHook.go:454/467`) dispatches on `input.Function` and passes the input through unchanged; no guard forces `RecipientAddr == CallerAddr` and there is no SC-destination validation on this path. 3. **Self-signer default satisfies the check:** `createDefaultOwnerPermission` (`accounts.go:

Announced Source revision 1
Original source ↗

GHSA-97cv-x867-6xhm

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:GHSA-97cv-x867-6xhm

github.com/klever-io/klever-go

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
1.7.20

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.7.20"
          }
        ]
      }
    ],
    "package": {
      "name": "github.com/klever-io/klever-go",
      "purl": "pkg:golang/github.com/klever-io/klever-go",
      "ecosystem": "Go"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-97cv-x867-6xhm/GHSA-97cv-x867-6xhm.json",
      "last_known_affected_version_range": "<= 1.7.19"
    }
  }
]
Related CVEs
CVE-2026-82405

Source reference: /aliases

Publisher severity

high

Source reference: /database_specific/severity

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-82405 · High

klever-go

Event
#63980 · Revision 1
Added to Heist Feed
Publisher date
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