High severity · published Mar 6, 2026
CVE-2026-30242
Plane: SSRF via Incomplete IP Validation in Webhook URL Serializer
8.5
CVSS
0.4%
EPSS
No
On KEV
Description
Plane is an an open-source project management tool. Prior to version 1.2.3, the webhook URL validation in plane/app/serializers/webhook.py only checks ip.is_loopback, 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. This issue has been patched in version 1.2.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PL
plane · makeplane
< 1.2.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30242
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30242
Release Notes
https://github.com/makeplane/plane/releases/tag/v1.2.3
Vendor Advisory
https://github.com/makeplane/plane/security/advisories/GHSA-fpx8-73gf-7x73
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