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.
CVE-2026-105633
HIGHPre-NVD 7.17.1Elevated
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.1Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 7.1
- EG Score
- 7.1HIGHlow confidence
- EG Risk
- 48EG Risk 48/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity71% × 45%Exploitation40% × 40%Automatability0% × 15%CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 5, 2026
Last Modified
October 5, 2026
Advisory Details (4)
Auto-updated Oct 5, 2026🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
githubMentions a patch (unverified)🟡 PoC Available
Issue Attachment Ownership Hijacking via Missing `issue_id` Scope · Advisory · makeplane/plane · GitHub
https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3wgithub_release Patch Available
v1.4.0
Patch available: makeplane/plane v1.4.0
https://github.com/makeplane/plane/releases/tag/v1.4.0github_pr
[WEB-7892] fix(security): scope attachment PATCH/DELETE/GET by issue_id, drop created_by overwrite (GHSA-5mxw-g5mw-3v3w)
Fix merged in makeplane/plane PR #9315 on 2026-07-01 — awaiting tagged release
https://github.com/makeplane/plane/pull/9315github_commit
commit 5829f0febf07 (makeplane/plane)
Fix landed in makeplane/plane commit 5829f0febf07 — awaiting tagged release
https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-05 19:24 UTCEG score recompute
- 2026-10-05 18:23 UTCEG score recompute
- 2026-10-05 18:01 UTCEG score recompute
- 2026-10-05 18:00 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(4)
What is CVE-2026-105633?
CVE-2026-105633 is a high vulnerability published on October 5, 2026. Plane is an open-source project management tool. Prior to 1.4.0, the V2 issue-attachment PATCH endpoint accepts issueid in the URL but omits it from the database query. A project member can use an issueid they control in the URL while targeting another user's attachment by its pk UUID. Because the…
When was CVE-2026-105633 disclosed?
CVE-2026-105633 was first published on October 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-105633?
CVE-2026-105633 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-105633?
A fix for CVE-2026-105633 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-105633
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