# CVE-2026-123782: ChatWiki before 2.10.0 Cross-Tenant IDOR via SaveFormField and UpdateFormRequired

Status: published. Published: 2026-11-06. Updated: 2026-11-09.

ChatWiki before 2.10.0 contains an insecure direct object reference vulnerability in SaveFormField and UpdateFormRequired that allows authenticated users to modify other tenants' form fields. Attackers can pass their own form_id to satisfy the ownership check alongside another tenant's sequential form_field id to alter field names, descriptions, types and required flags, disrupting how submitted entries are stored.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/zhimaAi/chatwiki/commit/81dd7a34be0322dd0881e1b8cfe85de337fdaf2b
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/zhimaAi/chatwiki/commit/d1ca145e283e2cb652e0b1002d5f14d6a46671e3

## Affected products and versions

- zhimaAi / chatwiki (zhimaAi/chatwiki): ≥ 0; < 2.10.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.24% as of 2026-11-09; percentile 15.63%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/zhimaAi/chatwiki/issues/182 (CNA: VulnCheck; issue-tracking)

- https://github.com/zhimaAi/chatwiki (CNA: VulnCheck; product)

- https://github.com/zhimaAi/chatwiki/commit/81dd7a34be0322dd0881e1b8cfe85de337fdaf2b (CNA: VulnCheck; patch)

- https://github.com/zhimaAi/chatwiki/commit/d1ca145e283e2cb652e0b1002d5f14d6a46671e3 (CNA: VulnCheck; patch)

- https://github.com/zhimaAi/chatwiki/releases/tag/v2.10.0 (CNA: VulnCheck; release-notes)

- https://github.com/zhimaAi/chatwiki/blob/v2.9.6/internal/app/chatwiki/business/manage/form.go#L307-L352 (CNA: VulnCheck; technical-description)

- https://github.com/zhimaAi/chatwiki/blob/v2.9.6/internal/app/chatwiki/business/manage/form.go#L385-L411 (CNA: VulnCheck; technical-description)

- https://hackmd.io/@hieund/chatwiki-form-field-cross-tenant-idor (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/chatwiki-before-2.10.0-cross-tenant-idor-via-saveformfield-and-updateformrequired (CNA: VulnCheck; third-party-advisory)

- https://github.com/zhimaAi/chatwiki (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/blob/v2.9.6/internal/app/chatwiki/business/manage/form.go#L307-L352 (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/blob/v2.9.6/internal/app/chatwiki/business/manage/form.go#L385-L411 (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/commit/81dd7a34be0322dd0881e1b8cfe85de337fdaf2b (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/commit/d1ca145e283e2cb652e0b1002d5f14d6a46671e3 (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/issues/182 (disclosure@vulncheck.com)

- https://github.com/zhimaAi/chatwiki/releases/tag/v2.10.0 (disclosure@vulncheck.com)

- https://hackmd.io/@hieund/chatwiki-form-field-cross-tenant-idor (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/chatwiki-before-2.10.0-cross-tenant-idor-via-saveformfield-and-updateformrequired (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-123782; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123782; retrieved 2026-11-10; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-123782; retrieved 2026-11-09; source updated Not reported

Revision: 8ec0b5ddad785e9e9ce49cf3c46c1982cb3cc124497dd7afc6699abab83a3e63

Canonical: https://y2.dev/cve/CVE-2026-123782

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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