# CVE-2026-4251: CityData CityChat ai.citydata.citychat credentials.json credentials storage

> Local attackers can extract credentials from an unprotected JSON file in the CityChat Android app, leading to potential data exposure.

- **Severity:** Low 2.0 (`CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2026
- **Updated:** 16 Mar 2026
- **Also known as:** GHSA-5cm8-hcmp-5vhm

## What is CVE-2026-4251?

CVE-2026-4251 is a low-severity vulnerability in CityData CityChat, published on 16 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was determined in CityData CityChat up to 0.12.6 on Android. Affected by this vulnerability is an unknown functionality of the file resources/assets/flutter_assets/assets/credentials.json of the component ai.citydata.citychat. Executing a manipulation can lead to unprotected storage of credentials. The attack requires local access. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-256 (Plaintext Storage of a Password), CWE-255

## Which versions are affected by CVE-2026-4251?


## How do I fix CVE-2026-4251?

No fix has been published for CVE-2026-4251 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4251 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4251 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4251 and fix it if it is affected.

What it is: CVE-2026-4251 is a low-severity vulnerability in CityData CityChat, published on 16 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4251 exists.

Affected product: CityData CityChat. 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-2026-4251/ (Markdown: https://insights.sbomify.com/CVE-2026-4251/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4251
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4251
- OSV: https://osv.dev/vulnerability/CVE-2026-4251

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4251/
Summaries are generated and may contain mistakes; the official description above is the record.