# CVE-2023-45149: Password of talk conversations can be bruteforced in Nextcloud

> Attackers can brute-force public conversation passwords in Nextcloud Talk due to missing rate limiting, potentially gaining unauthorized access.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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:** 16 Oct 2023
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-7rf8-pqmj-rpqv

## What is CVE-2023-45149?

CVE-2023-45149 is a medium-severity vulnerability in nextcloud security-advisories, published on 16 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nextcloud talk is a chat module for the Nextcloud server platform. In affected versions brute force protection of public talk conversation passwords can be bypassed, as there was an endpoint validating the conversation password without registering bruteforce attempts. It is recommended that the Nextcloud Talk app is upgraded to 15.0.8, 16.0.6 or 17.1.1. There are no known workarounds for this vulnerability.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2023-45149?

It affects 1 product.


Products: Nextcloud Talk.

## How do I fix CVE-2023-45149?

No fix has been published for CVE-2023-45149 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-45149 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-45149 exists.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2020-8180](https://insights.sbomify.com/CVE-2020-8180/): Code injection in Nextcloud Talk (critical 9.9)
- [CVE-2021-32689](https://insights.sbomify.com/CVE-2021-32689/): Nextcloud Talk not properly disassociating users from chats after account deletion (high 8.1)
- [CVE-2023-39957](https://insights.sbomify.com/CVE-2023-39957/): Path traversal allows tricking the Talk Android app into writing files into it's root directory (high 7.2)
- [CVE-2021-32676](https://insights.sbomify.com/CVE-2021-32676/): Session Fixation in Nextcloud Talk (medium 6.5)
- [CVE-2021-39222](https://insights.sbomify.com/CVE-2021-39222/): XSS in Talk (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-45149 and fix it if it is affected.

What it is: CVE-2023-45149 is a medium-severity vulnerability in nextcloud security-advisories, published on 16 Oct 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-2023-45149 exists.

Affected product: nextcloud security-advisories. 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-2023-45149/ (Markdown: https://insights.sbomify.com/CVE-2023-45149/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-45149
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-45149
- OSV: https://osv.dev/vulnerability/CVE-2023-45149

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-45149/
Summaries are generated and may contain mistakes; the official description above is the record.