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

Advisory record · `GHSA-97cv-x867-6xhm`

- **Identifiers:** `GHSA-97cv-x867-6xhm` · `CVE-2026-82405` · `GO-2026-6582`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-863](https://cwe.mitre.org/data/definitions/863.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 23 Sept 2026
- **Updated:** 1 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Sept 2026, 19:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/klever-io/klever-go` (Go): affected `<1.7.20`; fixed in `1.7.20`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Klever-Go versions before 1.7.20 are affected by an account takeover in the built-in function kleverUpdateAccountPermission. Its authorization check uses the attacker-controllable RecipientAddr instead of the authenticated caller, so a deployed smart contract can overwrite the permissions of any account that has configured permissions, without keys or signatures from the victim. Upgrade to version 1.7.20.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.7 High, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0043, the 37th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:12 UTC: First seen by agentprime
- 31 Oct 2026, 14:12 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-97cv-x867-6xhm)

## Sources

- [GitHub Advisory Database: GHSA-97cv-x867-6xhm](https://github.com/advisories/GHSA-97cv-x867-6xhm)
- [OSV: GHSA-97cv-x867-6xhm](https://osv.dev/vulnerability/GHSA-97cv-x867-6xhm)
- <https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm>
- <https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32>
- <https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9>
- <https://github.com/klever-io/klever-go>
- <https://github.com/klever-io/klever-go/releases/tag/v1.7.20>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-97cv-x867-6xhm>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-97cv-x867-6xhm/>. Everything for agents: <https://agentprime.io/llms.txt>.