CVE-2026-46403Public exploitNetwork attack vector

Contract deletion and upgrade via unenforced read-only mode

Published Jul 21, 2026 · Updated Jul 21, 2026

Protection mechanism failure in Klever-Go before 1.7.17 allows remote authenticated users to delete or upgrade contracts through read-only calls. ExecuteReadOnlyWithTypedArguments sets read-only runtime state, but delete and upgrade host paths ignore it and merge state-changing VM output. Exploitation requires an untrusted callee that owns an upgradeable or deletable target in a workflow that treats the nested call as non-mutating.

CVSS severity6.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failure in Klever-Go before 1.7.17 allows remote authenticated users to delete or upgrade contracts through read-only calls. ExecuteReadOnlyWithTypedArguments sets read-only runtime state, but delete and upgrade host paths ignore it and merge state-changing VM output. Exploitation requires an untrusted callee that owns an upgradeable or deletable target in a workflow that treats the nested call as non-mutating.

The record

CVE
CVE-2026-46403
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Klever Foundation
Product
Klever-Go
Classifications
CWE-693, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.7.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Klever Foundation · Klever-Goversion=< 1.7.17

Published CVSS scores

6.3GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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