# CVE-2019-15620: Information disclosure in Nextcloud Talk

> Attackers can leak the existence and names of private conversations in Nextcloud Talk by linking them to shared items via the projects feature.

- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Feb 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-hfx4-g7m9-jj99

## What is CVE-2019-15620?

CVE-2019-15620 is a low-severity vulnerability in Nextcloud Talk, published on 4 Feb 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Improper access control in Nextcloud Talk 6.0.3 leaks the existance and the name of private conversations when linked them to another shared item via the projects feature.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2019-15620?

It affects 1 product.


Products: Nextcloud Talk.

## How do I fix CVE-2019-15620?

No fix has been published for CVE-2019-15620 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15620 being exploited?

There is no known exploitation of CVE-2019-15620 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Talk

- [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-2019-15620 and fix it if it is affected.

What it is: CVE-2019-15620 is a low-severity vulnerability in Nextcloud Talk, published on 4 Feb 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-15620 in the wild and no public exploit code.

Affected product: Nextcloud Talk. 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-2019-15620/ (Markdown: https://insights.sbomify.com/CVE-2019-15620/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15620
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15620
- OSV: https://osv.dev/vulnerability/CVE-2019-15620

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15620/
Summaries are generated and may contain mistakes; the official description above is the record.