# CVE-2026-111656: ChatWiki through 2.9.6 Cross-Tenant IDOR via Form Filter Management Endpoints

> Authenticated users can access and modify other tenants' form filters by manipulating form_id parameters in ChatWiki.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-wqfw-mf45-5858

## What is CVE-2026-111656?

CVE-2026-111656 is a medium-severity missing authorization vulnerability in zhimaAi chatwiki, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

ChatWiki through 2.9.6 contains an insecure direct object reference vulnerability that allows authenticated users to access another tenant's form filters by supplying arbitrary form_id values. Attackers can send sequential form_id values to getFormFilterList, getFormFilterInfo and updateFormFilterSort to read filter rules and overwrite another tenant's filter sort order.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-111656?


## How do I fix CVE-2026-111656?

No fix has been published for CVE-2026-111656 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111656 being exploited?

There is no known exploitation of CVE-2026-111656 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111656 and fix it if it is affected.

What it is: CVE-2026-111656 is a medium-severity missing authorization vulnerability in zhimaAi chatwiki, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-111656 in the wild and no public exploit code.

Affected product: zhimaAi chatwiki. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-111656/ (Markdown: https://insights.sbomify.com/CVE-2026-111656/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111656
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111656
- OSV: https://osv.dev/vulnerability/CVE-2026-111656

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111656/
Summaries are generated and may contain mistakes; the official description above is the record.