CVE-2026-82405

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: HIGH
CVSS score: 8.7 / 10
CVSS 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
Effective score: 8.7 / 10 HIGH source: CNA overview
CWE(s): CWE-863
Reserved: 2026-08-28
Published: 2026-09-23 19:26 UTC
Last updated: 2026-09-23 19:26 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/82xxx/CVE-2026-82405.json
Linked Threat: CVE-2026-82405 — Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-controlled `RecipientAddr` instead of the authenticated caller

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-23 20:17:16 UTC
NVD last modified: 2026-09-23 20:17:16 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85648

EUVD enrichment is queued; refresh the page in a few seconds.

Affected products (1)

Vendor	Product	Versions	Platforms
klever-io	klever-go	`< 1.7.20` (affected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

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

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

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

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-82405 - Vulnerability Details - OpenCVE

web:app.opencve.io

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 ...

2026-09-24 11:11 UTC
CVE-2026-82405 | Permission Escalation in Klever-Go Blockchain

web:basefortify.eu

Vulnerability report for CVE-2026-82405 , including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

2026-09-24 11:11 UTC
CVE-2026-82405 - Klever-Go Account takeover ... - cvefeed.io

web:cvefeed.io

The following list is the news that have been mention CVE-2026-82405 vulnerability anywhere in the article. Results are limited to the first 20 news articles due to potential performance issues. The following table lists the changes that have been made to the CVE-2026-82405 vulnerability over time.

2026-09-24 11:11 UTC
CVE-2026-82405: CVE-2026-82405: Incorrect Authorization leading to ...

web:cvereports.com

A critical incorrect authorization vulnerability (CWE-863) exists in the Go implementation of the Klever blockchain protocol (klever-go) prior to version 1.7.20. The vulnerability allows an attacker to completely replace a target account's permission set by manipulating the RecipientAddr parameter in a VM built-in function, leading to total account takeover.

2026-09-24 11:11 UTC
CVE-2026-82405 - Exploits & Severity - Feedly

web:feedly.com

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

2026-09-24 11:11 UTC
CVE-2026-82405: Product identification pending

web:itknowledgebases.com

CVE-2026-82405 (Product identification pending): High-severity vulnerability requiring prioritized review.

2026-09-24 11:11 UTC
CVE-2026-82405: Fix Available - High | TridentStack

web:tridentstack.com

How severe is CVE-2026-82405 ? CVE-2026-82405 has a CVSS v4 base score of 8.7, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

2026-09-24 11:11 UTC
CVE-2026-82405: klever-io klever-go: Klever-Go is the Go ... - Rapid7

web:www.rapid7.com

CVE-2026-82405 : klever-io klever-go: Klever-Go is the Go implementation of the Klever blockchain protocol. View severity, references, and remediation details from Rapid7.

2026-09-24 11:11 UTC
CVE-2026-82405: Incorrect Authorization Vulnerability (CVSS 8.7)

web:www.strix.ai

How severe is CVE-2026-82405 ? CVE-2026-82405 has a CVSS score of 8.7/10 (HIGH severity). How do I fix CVE-2026-82405 ? Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

2026-09-24 11:11 UTC
CVE-2026-82405 - Tenable

web:www.tenable.com

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 ...

2026-09-24 11:11 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-82405.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "klever-go",
          "vendor": "klever-io",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.7.20"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-23T19:26:12.967Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm"
        },
        {
          "name": "https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32"
        },
        {
          "name": "https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9"
        },
        {
          "name": "https://github.com/klever-io/klever-go/releases/tag/v1.7.20",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/klever-io/klever-go/releases/tag/v1.7.20"
        }
      ],
      "source": {
        "advisory": "GHSA-97cv-x867-6xhm",
        "discovery": "UNKNOWN"
      },
      "title": "Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-controlled `RecipientAddr` instead of the authenticated caller"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-82405",
    "datePublished": "2026-09-23T19:26:12.967Z",
    "dateReserved": "2026-08-28T22:00:43.513Z",
    "dateUpdated": "2026-09-23T19:26:12.967Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}