# CVE-2023-49095: nexkey allows arbitrary users to impersonate any remote user due to missing signature validation

> Attackers can impersonate any remote user due to missing signature validation in ActivityPub requests, allowing unauthorized access and identity spoofing.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Nov 2023
- **Updated:** 27 Nov 2024
- **Also known as:** GHSA-fpxw-rw9v-2gmx

## What is CVE-2023-49095?

CVE-2023-49095 is a high-severity authentication bypass vulnerability in nexryai nexkey, published on 30 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

nexkey is a microblogging platform. Insufficient validation of ActivityPub requests received in inbox could allow any user to impersonate another user in certain circumstances. This issue has been patched in version 12.122.2.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2023-49095?

It affects 1 product.


Products: Nexryai Nexkey.

## How do I fix CVE-2023-49095?

No fix has been published for CVE-2023-49095 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-49095 being exploited?

There is no known exploitation of CVE-2023-49095 in the wild and no public exploit code.

## Other vulnerabilities in nexryai nexkey

- [CVE-2023-52077](https://insights.sbomify.com/CVE-2023-52077/): External apps using tokens issued by administrators and moderators can call admin APIs (high 8.9)
- [CVE-2023-43805](https://insights.sbomify.com/CVE-2023-43805/): Nexkey allows users to bypass authentication of Bull dashboard (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49095 and fix it if it is affected.

What it is: CVE-2023-49095 is a high-severity authentication bypass vulnerability in nexryai nexkey, published on 30 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-49095 in the wild and no public exploit code.

Affected product: nexryai nexkey. 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-2023-49095/ (Markdown: https://insights.sbomify.com/CVE-2023-49095/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49095
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49095
- OSV: https://osv.dev/vulnerability/CVE-2023-49095

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49095/
Summaries are generated and may contain mistakes; the official description above is the record.