CVE-2026-104973: Plane: DNS Rebinding Bypass of CVE-2026-30242 SSRF Fix in Webhook Delivery

Severity: high (CVSS 7.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-05 · updated 2026-10-07
Weakness: CWE-918

Description

Plane is an open-source project management tool. Prior to 1.4.0, the fix for CVE-2026-30242 validates webhook IP addresses only when the webhook is created in apps/api/plane/app/serializers/webhook.py. The delivery task in apps/api/plane/bgtasks/webhook_task.py performs a separate DNS resolution when sending the request and does not validate the resolved IP address, allowing DNS rebinding to bypass the SSRF protection. This issue is fixed in 1.4.0.

Affected products

makeplane plane: before 1.4.0

References

https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615
https://github.com/makeplane/plane/pull/9163
https://github.com/makeplane/plane/releases/tag/v1.4.0
https://github.com/makeplane/plane/security/advisories/GHSA-whh3-5g95-4qhc
https://github.com/cthackers/adm-zip/security/advisories/GHSA-j5f4-cc29-5x44

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