# CVE-2026-50173: Flow-Like: Azure invoke presign grants app content write SAS to ExecuteEvents-only users

> Authenticated users with execute permissions can write or delete app content in Azure-backed self-hosted deployments due to incorrect SAS token generation.

- **Severity:** High 7.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Aug 2026
- **Updated:** 19 Aug 2026

## What is CVE-2026-50173?

CVE-2026-50173 is a high-severity missing authorization vulnerability in Rheosoph flow-like, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Flow-Like is a platform for building end-to-end use cases. Prior to version 1.0.4, `GET /api/v1/apps/{app_id}/invoke/presign` grants Azure Blob Storage SAS credentials with write and delete access to app content to any app member that has `ExecuteEvents`, even when that member lacks `ReadFiles` and `WriteFiles`. The route treats file permissions as optional after the `ExecuteEvents` gate. When the caller has neither file permission, it selects `CredentialsAccess::InvokeNone`. In the Azure credential provider, `InvokeNone` still mints a `content_sas_token` for `apps/{app_id}` with `sp=rwdl`, plus user-content and log SAS tokens. The returned shared credential is enough for the low-privilege caller to directly write or delete blobs under the app content prefix. Version 1.0.4 patches the issue. Flow-Like Studio and the hosted Flow-Like Web App are not affected. These deployments use AWS-backed storage. Self-hosted deployments are only affected if they use Azure Blob Storage as the storage backend. In affected deployments, the issue only applies to authenticated app members who have workflow execution permissions but should not have app file write/delete permissions. Users of affected self-hosted Azure deployments should update to version 1.0.4 or the latest dev branch.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-50173?


## How do I fix CVE-2026-50173?

No fix has been published for CVE-2026-50173 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-50173 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50173 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50173 and fix it if it is affected.

What it is: CVE-2026-50173 is a high-severity missing authorization vulnerability in Rheosoph flow-like, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50173 exists.

Affected product: Rheosoph flow-like. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-50173/ (Markdown: https://insights.sbomify.com/CVE-2026-50173/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50173
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50173
- OSV: https://osv.dev/vulnerability/CVE-2026-50173

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50173/
Summaries are generated and may contain mistakes; the official description above is the record.