CVE-2026-105636

CRITICALPre-NVD 9.99.9
EchelonGraph scoreLOW confidence

This critical-severity CVE scores 9.9 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
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Plane is an open-source project management tool. Prior to 1.4.0, the webhook delivery task in apps/api/plane/bgtasks/webhook_task.py calls requests.post() without allow_redirects=False and does not validate redirect targets. validate_url() blocks private, loopback, link-local, and reserved addresses in the original webhook URL, but the final URL reached after one or more redirects is not checked. A user who can create a workspace can register a webhook pointing to an attacker-controlled public endpoint that returns a 302 redirect to an internal address. The Plane worker then fetches internal resources, including cloud metadata, and stores the response body in webhook_logs, where the attacker can retrieve it through the workspace webhook-logs API. This issue is fixed in 1.4.0.

CVSS v3
9.9
EG Score
9.9CRITICALlow confidence
EG Risk
49
EG Risk 49/100CISA 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 computed
Severity99% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). 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_commit, github_pr, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

SSRF via HTTP redirect in webhook delivery (allow_redirects not set) · Advisory · makeplane/plane · GitHub

https://github.com/makeplane/plane/security/advisories/GHSA-mq87-52pf-hm3h
github_release Patch Available

v1.4.0

Patch available: makeplane/plane v1.4.0

https://github.com/makeplane/plane/releases/tag/v1.4.0
github_pr

fix: harden webhook/link/OAuth-avatar SSRF (advisory clusters A/B/C/E)

Fix merged in makeplane/plane PR #9163 on 2026-05-30 — awaiting tagged release

https://github.com/makeplane/plane/pull/9163
github_commit

commit 04622ce1188c (makeplane/plane)

Fix landed in makeplane/plane commit 04622ce1188c — awaiting tagged release

https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 3× 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.

  1. 2026-10-05 19:24 UTCEG score recompute
  2. 2026-10-05 18:26 UTCEG score recompute
  3. 2026-10-05 18:25 UTCMITRE cvelistV5first tracked

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Frequently asked(4)

What is CVE-2026-105636?
CVE-2026-105636 is a critical vulnerability published on October 5, 2026. Plane is an open-source project management tool. Prior to 1.4.0, the webhook delivery task in apps/api/plane/bgtasks/webhooktask.py calls requests.post() without allowredirects=False and does not validate redirect targets. validateurl() blocks private, loopback, link-local, and reserved addresses…
When was CVE-2026-105636 disclosed?
CVE-2026-105636 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-2026-105636?
CVE-2026-105636 has a CVSS base score of 9.9 (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-2026-105636?
A fix for CVE-2026-105636 is available: update to the fixed version the vendor names in its advisory.

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