# CVE-2026-56227 — Capgo

> As of 2026-06-20, CVE-2026-56227 is a MEDIUM-severity vulnerability in Capgo, CVSS v3.1 5.4. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56227 as of 2026-06-20; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-20

## What is CVE-2026-56227?

Capgo before 12.128.2 contains a server-side request forgery vulnerability in webhook URL validation that allows loopback and internal addresses. Organization admins can configure webhooks pointing to localhost or 127.0.0.1, and when triggered, the backend performs outbound requests to these addresses with error responses disclosed to users.

The record classifies CVE-2026-56227 under weakness class [CWE-918](https://intel.threadlinqs.com/cwe/CWE-918). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 107 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:L`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-20

## Is CVE-2026-56227 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Capgo](https://intel.threadlinqs.com/vendors/capgo): Capgo

## How to fix CVE-2026-56227

No vendor patch reference has been recorded for CVE-2026-56227 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-56227

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56227, 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, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-21.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56227
Full detection coverage and IOCs for threats exploiting CVE-2026-56227 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp