CVE-2020-8121 Information disclosure in Nextcloud Server
High 8.1
Published
Updated
Check this codebase for CVE-2020-8121 and fix it if it is affected.
What it is: CVE-2020-8121 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 4 Feb 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-8121 in the wild and no public exploit code.
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-2020-8121/ (Markdown: https://insights.sbomify.com/CVE-2020-8121/index.md)
Attackers can access more data than intended in reshared link shares on Nextcloud Server, leading to unauthorized information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-8121?
CVE-2020-8121 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 4 Feb 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A bug in Nextcloud Server 14.0.4 could expose more data in reshared link shares than intended by the sharer.
Which versions are affected by CVE-2020-8121?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2020-8121?
No fix has been published for CVE-2020-8121 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-8121 being exploited?
There is no known exploitation of CVE-2020-8121 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-63cq-5v5v-47mp.