Plane has SSRF via Incomplete IP Validation in Webhook URL Serializer

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

EPSS

• CVE-2026-30242: 0.38% estimated exploitation activity in the next 30 days; percentile 31.50 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The webhook URL validation in plane/app/serializers/webhook.py only checks ip.isloopback, allowing attackers with workspace ADMIN role to create webhooks pointing to private/internal network addresses (10.x.x.x, 172.16.x.x, 192.168.x.x, 169.254.169.254, etc.). When webhook events fire, the server makes requests to these internal addresses and stores the response — enabling SSRF with full response read-back. Impact - Cloud metadata exfiltration: Access AWS/GCP/Azure instance metadata (IAM credentials, tokens) - Internal service scanning: Probe internal network services not exposed to the internet - Data exfiltration via response logs: Full response body from internal services is stored and returned to the attacker through the webhook logs API - Bypass vectors: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16, 0.0.0.0, ::ffff: mapped addresses

Published by the source

5 Mar 2026, 21:43 UTC

Last modified by the source

9 Mar 2026, 13:16 UTC

Source last checked

26 Oct 2026, 13:37 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-fpx8-73gf-7x73

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-fpx8-73gf-7x73

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# Patch Next advisory brief: CVE-2026-30242

Advisory: Plane has SSRF via Incomplete IP Validation in Webhook URL Serializer
IDs: CVE-2026-30242, GHSA-fpx8-73gf-7x73
Record: https://patchnext.com/advisories/cve-2026-30242 (revision 2, source checked 26 Oct 2026, 13:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: plane 1.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI plane: affected <= 1.2.1; fixed in 1.2.3

## Suggested inspection (read-only)
- `python -m pip show plane`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on plane.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-fpx8-73gf-7x73 (OSV record GHSA-fpx8-73gf-7x73 lists affected ranges: PyPI plane >=0 <1.2.3 (fixed))
- Verified: https://github.com/advisories/GHSA-fpx8-73gf-7x73 (GitHub-reviewed advisory GHSA-fpx8-73gf-7x73 lists affected ranges: PyPI plane >=0 <=1.2.1)

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