# CVE-2026-35443: NamelessMC: Forum reactions bypass the "view own topics only" restriction

> Attackers can read and modify reactions on other users' topics in forums restricted to viewing own topics only.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-wcrf-5gcp-pf64

## What is CVE-2026-35443?

CVE-2026-35443 is a medium-severity missing authorization vulnerability in NamelessMC Nameless, published on 2 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

NamelessMC is website software for Minecraft servers. In version 2.2.4, `modules/Forum/classes/ForumPostReactionContext.php` only verifies that the caller can view the forum, but it does not re-enforce topic-level `view_other_topics` authorization. As a result, in forums where users may enter the forum but may only view their own topics, reactions can still be read and modified on other users' topics. Version 2.2.5 fixes the issue.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-35443?


## How do I fix CVE-2026-35443?

No fix has been published for CVE-2026-35443 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-35443 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35443 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-35443 and fix it if it is affected.

What it is: CVE-2026-35443 is a medium-severity missing authorization vulnerability in NamelessMC Nameless, published on 2 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35443 exists.

Affected product: NamelessMC Nameless. 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-2026-35443/ (Markdown: https://insights.sbomify.com/CVE-2026-35443/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-35443
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35443
- OSV: https://osv.dev/vulnerability/CVE-2026-35443

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-35443/
Summaries are generated and may contain mistakes; the official description above is the record.