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CVE-2026-105633— Plane: Issue Attachment Ownership Hijacking via Missing `issue_id` Scope

Quick assessment

Affected
makeplane plane
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Plane 是一款开源的项目管理工具。在 1.4.0 版本之前，V2 版本的 issue-attachment PATCH 端点虽然在 URL 中接受了 issue_id，但在数据库查询中却忽略了该参数。项目成员可以利用自己控制的 issue_id 作为 URL 中的参数，同时通过其主键 UUID 针对另一个用户的附件进行操作。由于服务器仅根据主键（pk）、工作区（workspace）和项目 ID（project_id）进行匹配，因此无论 URL 中的 issue_id 为何，它都会修改相应的附件。当附件处于待处理

CVSS 7.1 · High
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I. Basic Information for CVE-2026-105633

Vulnerability Information
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Vulnerability Title
Plane: Issue Attachment Ownership Hijacking via Missing `issue_id` Scope
Source: CVE Program / CVE List V5
Vulnerability Description
Plane is an open-source project management tool. Prior to 1.4.0, the V2 issue-attachment PATCH endpoint accepts issue_id in the URL but omits it from the database query. A project member can use an issue_id they control in the URL while targeting another user's attachment by its pk UUID. Because the server matches only pk, workspace, and project_id, it modifies the attachment regardless of the issue_id in the URL. When the attachment is pending and has not been confirmed as uploaded, the PATCH handler sets created_by = request.user and transfers attachment ownership to the attacker. This issue is fixed in 1.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
makeplane plane < 1.4.0 -

II. Public POCs for CVE-2026-105633

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III. Intelligence Information for CVE-2026-105633

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Other References for CVE-2026-105633 (4)

Same Patch Batch · makeplane · 2026-10-05 · 38 CVEs total

CVE-2026-105636 9.9 CRITICAL Plane: SSRF via HTTP redirect in webhook delivery (allow_redirects not set)
CVE-2026-105639 9.8 CRITICAL Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation tok
CVE-2026-105641 9.8 CRITICAL Plane: Hardcoded SECRET_KEY and LIVE_SERVER_SECRET_KEY shipped in aio/cli community deploy
CVE-2026-105637 9.6 CRITICAL Plane: Cross-Project Asset Hijacking via 'ProjectBulkAssetEndpoint' (sibling of CVE-2026-4
CVE-2026-105638 9.1 CRITICAL Plane: Magic-code verifier endpoint has no rate limit, enabling 6-digit OTP brute force
CVE-2026-105640 9.1 CRITICAL Plane: Account Takeover via Unverified OAuth Email Match (Gitea, self-managed GitLab)
CVE-2026-105630 8.7 HIGH Plane: Stored XSS via SVG attachment served inline on the application origin (account take
CVE-2026-104892 8.7 HIGH Plane: Plaintext logging of API token
CVE-2026-104966 8.7 HIGH Plane: Cross-Workspace IDOR in Estimate and Comment Endpoints Allows Read, Modify, and Inj
CVE-2026-104976 8.7 HIGH Plane: SSRF in Gitea OAuth
CVE-2026-104979 8.7 HIGH Plane: Cross-tenant stored XSS in intake enables account takeover
CVE-2026-105632 8.7 HIGH Plane: Broken Access Control - joinProject GraphQL mutation allows self-join into private
CVE-2026-104968 8.7 HIGH Plane: Cross-workspace member enumeration via /api/workspaces/{slug}/entity-search/
CVE-2026-104971 8.5 HIGH Plane: Cross-Workspace Asset Duplication IDOR + WorkspaceFileAssetEndpoint and FileAssetEn
CVE-2026-104978 8.2 HIGH Plane: Invitation Hijack in Project Join Flow via Missing Authorization and Email-Only Acc
CVE-2026-104970 8.1 HIGH Plane: InstanceAdminSignUpEndpoint TOCTOU race allows two concurrent unauthenticated calle
CVE-2026-105634 8.1 HIGH Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles
CVE-2026-104974 8.1 HIGH Plane: Disabled User Auto-Reactivation on Login
CVE-2026-104977 7.7 HIGH Plane: Incomplete fix of CVE-2026-27706 — SSRF still reachable on: missing is_blocked_ip (
CVE-2026-104973 7.6 HIGH Plane: DNS Rebinding Bypass of CVE-2026-30242 SSRF Fix in Webhook Delivery

Showing top 20 of 38 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: plane
Same vendor: makeplane
Same weakness: CWE-639

V. Comments for CVE-2026-105633

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