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CVE-2026-82409— Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/indexer data forgery

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it. The

CVSS 8.4 · High

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.20 affected
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I. Basic Information for CVE-2026-82409

Vulnerability Information

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Vulnerability Title
Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/indexer data forgery
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it. The SetAccountName transaction accepts valid UTF-8 account names containing quotes, backslashes, and newlines, and the resulting name is stored in consensus account state. When an indexer processes the account, those characters can break the JSON string, reject a bulk batch, or inject additional bulk actions that create, overwrite, or delete documents in indices writable by the indexer. The persistent state value is replayed by new or historical indexers, and direct access to the indexing host or Elasticsearch port is not required. This issue is fixed in version 1.7.20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.20 -

II. Public POCs for CVE-2026-82409

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III. Intelligence Information for CVE-2026-82409

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Other References for CVE-2026-82409 (4)

Same Patch Batch · klever-io · 2026-09-23 · 6 CVEs total

CVE-2026-82405 8.7 HIGH Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-control
CVE-2026-86064 8.6 HIGH Klever-Go: /log controls global node logging
CVE-2026-86065 7.5 HIGH Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, pe
CVE-2026-82406 7.1 HIGH Klever-Go: Zombie-order theft: `Buy` missing `IsClaimed` guard in native marketplace
CVE-2026-82407 7.0 HIGH Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus livene

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-116

V. Comments for CVE-2026-82409

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