# CVE-2023-49791: Workflows do not require password confirmation on API level

> Attackers with active sessions can bypass password confirmation to modify or delete workflows via direct API calls.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **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:** 22 Dec 2023
- **Updated:** 12 Sep 2024
- **Also known as:** GHSA-3f8p-6qww-2prr

## What is CVE-2023-49791?

CVE-2023-49791 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 22 Dec 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when an attacker manages to get access to an active session of another user via another way, they could delete and modify workflows by sending calls directly to the API bypassing the password confirmation shown in the UI. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.

Weakness: CWE-287 (Improper Authentication), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2023-49791?

It affects 1 product.


Products: Nextcloud Nextcloud Server.

## How do I fix CVE-2023-49791?

No fix has been published for CVE-2023-49791 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-49791 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-49791 exists.

## Other vulnerabilities in Nextcloud Nextcloud Server

- [CVE-2021-32802](https://insights.sbomify.com/CVE-2021-32802/): Preview generation used third-party library not suited for user-generated content in Nextcloud server (critical 9.3)
- [CVE-2023-26482](https://insights.sbomify.com/CVE-2023-26482/): Scope of workflow operations is not validated in nextcloud server (critical 9.1)
- [CVE-2018-3775](https://insights.sbomify.com/CVE-2018-3775/): Auth bypass in Nextcloud Server (high 8.8)
- [CVE-2023-35172](https://insights.sbomify.com/CVE-2023-35172/): Nextcloud Server password reset endpoint is not brute force protected (high 8.7)
- [CVE-2023-32320](https://insights.sbomify.com/CVE-2023-32320/): Nextcloud Server's brute force protection allows someone to send more requests than intended (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49791 and fix it if it is affected.

What it is: CVE-2023-49791 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 22 Dec 2023. 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-2023-49791 exists.

Affected product: Nextcloud Nextcloud Server. 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-2023-49791/ (Markdown: https://insights.sbomify.com/CVE-2023-49791/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49791
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49791
- OSV: https://osv.dev/vulnerability/CVE-2023-49791

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49791/
Summaries are generated and may contain mistakes; the official description above is the record.