# CVE-2025-67500: Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

> Attackers can enumerate the existence of private statuses by exploiting error handling discrepancies in Mastodon server responses.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Dec 2025
- **Updated:** 8 Jan 2026
- **Also known as:** BIT-mastodon-2025-67500, GHSA-gwhw-gcjx-72v8

## What is CVE-2025-67500?

CVE-2025-67500 is a low-severity vulnerability in mastodon, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.

Weakness: CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2025-67500?

1 open source package ship an affected version, including mastodon. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mastodon` | Bitnami | All versions | 4.2.28, 4.3.15, 4.4.10, 4.5.3 |

Products: Joinmastodon Mastodon.

## How do I fix CVE-2025-67500?

Upgrade mastodon to a fixed version for your release line: 4.2.28, 4.3.15, 4.4.10 or 4.5.3.

## Is CVE-2025-67500 being exploited?

There is no known exploitation of CVE-2025-67500 in the wild and no public exploit code.

## Other vulnerabilities in mastodon

- [CVE-2023-36460](https://insights.sbomify.com/CVE-2023-36460/): Mastodon vulnerable to arbitrary file creation through media attachments (critical 10.0)
- [CVE-2022-2166](https://insights.sbomify.com/CVE-2022-2166/): Improper Restriction of Excessive Authentication Attempts in mastodon/mastodon (critical 9.8)
- [CVE-2022-24307](https://insights.sbomify.com/CVE-2022-24307/): Missing authorization in n/a (critical 9.8)
- [CVE-2018-21018](https://insights.sbomify.com/CVE-2018-21018/): Auth bypass in n/a (critical 9.8)
- [CVE-2024-23832](https://insights.sbomify.com/CVE-2024-23832/): Mastodon Remote user impersonation and takeover (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-67500 and fix it if it is affected.

What it is: CVE-2025-67500 is a low-severity vulnerability in mastodon, published on 9 Dec 2025. 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-2025-67500 in the wild and no public exploit code.

Affected packages and fixed versions:
- mastodon (Bitnami): affected all versions; fixed in 4.2.28, 4.3.15, 4.4.10, 4.5.3

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-2025-67500/ (Markdown: https://insights.sbomify.com/CVE-2025-67500/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-67500
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-67500
- OSV: https://osv.dev/vulnerability/CVE-2025-67500

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-67500/
Summaries are generated and may contain mistakes; the official description above is the record.