---
id: "CVE-2026-51954"
kind: "vulnerability"
aliases: ["CVE-2026-51954"]
title: "Webasyst Framework: crafted OAuth redirect_uri lets remote attacker run code"
severity: "unknown"
cvss: null
epss: 0.00511
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["php", "runtime", "self-hosted", "webasyst"]
not_affected_if: ["newer-version"]
published_at: "2026-10-22T16:17:36+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-25T05:00:26+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-51954", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-51954", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Webasyst Framework: crafted OAuth redirect_uri lets remote attacker run code

Webasyst Framework 4.0.3 and earlier mishandles OAuth authorization URLs that carry an arbitrary redirect_uri. A remote attacker can craft such a URL to execute arbitrary code on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Webasyst Framework version against `4.0.3`; versions at or below it are in scope per the NVD description
- unknown whether the OAuth endpoint is enabled by default

## Fix

- unknown; the sources do not name a fixed version. Check the Webasyst vendor release notes for a version later than `4.0.3`

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-51954
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-51954

## From the sources

An issue in Webasyst Framework 4.0.3 and before allows a remote attacker to execute arbitrary code via a crafted OAuth authorization URL with an arbitrary redirect_uri.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_