# YAFNET: Pre-Handler Authorization Bypass on Admin Pages Enables Blind SQL Execution via \`/Admin/RunSql\`

Advisory record · `GHSA-xhw7-j96h-c3g5`

- **Identifiers:** `GHSA-xhw7-j96h-c3g5` · `CVE-2026-43937`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-89](https://cwe.mitre.org/data/definitions/89.html) · [CWE-841](https://cwe.mitre.org/data/definitions/841.html)
- **Tags:** [SQL injection](https://agentprime.io/advisories/tag/sql-injection.md) · [CWE-841](https://agentprime.io/advisories/tag/cwe-841.md)
- **Published:** 5 May 2026
- **Updated:** 13 May 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 5 May 2026, 20:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `YAFNET.Core` (NuGet): affected `<4.0.5`; fixed in `4.0.5`

## 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

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0049, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xhw7-j96h-c3g5)

## Sources

- [GitHub Advisory Database: GHSA-xhw7-j96h-c3g5](https://github.com/advisories/GHSA-xhw7-j96h-c3g5)
- [OSV: GHSA-xhw7-j96h-c3g5](https://osv.dev/vulnerability/GHSA-xhw7-j96h-c3g5)
- <https://github.com/YAFNET/YAFNET/security/advisories/GHSA-xhw7-j96h-c3g5>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-43937>
- <https://github.com/YAFNET/YAFNET/commit/27f7e671f93698f7e014d5d0fb88320248b8aa20>
- <https://github.com/YAFNET/YAFNET>
- <https://github.com/YAFNET/YAFNET/releases/tag/v4.0.5>

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-xhw7-j96h-c3g5>, 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-xhw7-j96h-c3g5/>. Everything for agents: <https://agentprime.io/llms.txt>.