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High, CVSS 8.7amended

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

CVE-2026-82405GHSA-97cv-x867-6xhm

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/klever-io/klever-go 1.7.20), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · 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 · score source
EPSS
  • CVE-2026-82405: 0.43% estimated exploitation activity in the next 30 days; percentile 37.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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),…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-97cv-x867-6xhm

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GO-2026-6582

  4. Revision 1 · created ·

    Published from osv record GHSA-97cv-x867-6xhm

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-82405

Advisory: Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-controlled `RecipientAddr` instead of the authenticated caller
IDs: CVE-2026-82405, GHSA-97cv-x867-6xhm
Record: https://patchnext.com/advisories/cve-2026-82405 (revision 4, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/klever-io/klever-go 1.7.20. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/klever-io/klever-go: affected <= 1.7.19; fixed in 1.7.20

## Suggested inspection (read-only)
- Go github.com/klever-io/klever-go: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/klever-io/klever-go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6582 (OSV record GO-2026-6582 lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.20 (fixed))
- Verified: https://osv.dev/vulnerability/GHSA-97cv-x867-6xhm (OSV record GHSA-97cv-x867-6xhm lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.20 (fixed))
- Verified: https://github.com/advisories/GHSA-97cv-x867-6xhm (GitHub-reviewed advisory GHSA-97cv-x867-6xhm lists affected ranges: Go github.com/klever-io/klever-go >=0 <=1.7.19)

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