# CVE-2026-71809

> As of 2026-09-09, CVE-2026-71809 is a vulnerability, EPSS 0.2% (15.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-71809 as of 2026-09-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-09

## What is CVE-2026-71809?

Authentication Bypass via Hardcoded Master Verification Code vulnerability in Siam Ordering (siam-server) 1.0.0 allows remote unauthenticated attackers to log in as any user, merchant, or administrator.

The identifier was first published 26 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 15.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-09

## Is CVE-2026-71809 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-71809 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-71809

No vendor patch reference has been recorded for CVE-2026-71809 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-71809

No threat campaign in the Threadlinqs corpus currently references CVE-2026-71809, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-09-11. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [github.com](https://github.com/W000i/vuln/issues/11)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-71809
Full detection coverage and IOCs for threats exploiting CVE-2026-71809 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp