# CVE-2026-70561: TestLink 1.9.20 and prior Authenticated IDOR via attachmentdownload.php

> Authenticated users can bypass project access controls to read arbitrary attachments from private projects by enumerating attachment IDs.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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:** 7 Aug 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-wmvr-m7cj-9g8w

## What is CVE-2026-70561?

CVE-2026-70561 is a high-severity missing authorization vulnerability in TestLinkOpenSourceTRMS TestLink, published on 7 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

TestLink 1.9.20 and prior contains an insecure direct object reference vulnerability that allows any authenticated user, including low-privilege guest accounts, to read arbitrary attachments by supplying an integer attachment ID to the attachmentdownload.php handler without any project or role authorization check. Attackers can enumerate sequential integer IDs through the attachment download endpoint to retrieve file contents from private projects they have no membership in, bypassing the per-project access control model and exposing test specifications, requirements documents, execution evidence, and other sensitive uploaded files across the entire installation.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-70561?


## How do I fix CVE-2026-70561?

No fix has been published for CVE-2026-70561 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-70561 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-70561 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-70561 and fix it if it is affected.

What it is: CVE-2026-70561 is a high-severity missing authorization vulnerability in TestLinkOpenSourceTRMS TestLink, published on 7 Aug 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-2026-70561 exists.

Affected product: TestLinkOpenSourceTRMS TestLink. 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-2026-70561/ (Markdown: https://insights.sbomify.com/CVE-2026-70561/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70561
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70561
- OSV: https://osv.dev/vulnerability/CVE-2026-70561

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70561/
Summaries are generated and may contain mistakes; the official description above is the record.