CVE-2026-30242Network attack vector

Full-response SSRF via loopback-only webhook validation

Published Mar 6, 2026 · Updated Mar 6, 2026

SSRF in Plane before 1.2.3 allows remote authenticated users to read internal HTTP responses through workspace webhooks. The URL serializer in plane/app/serializers/webhook.py rejects only loopback addresses, then the server fetches other private and link-local targets and records their full response bodies. Workspace ADMIN access and a triggered webhook event are required; exposed data is limited to services reachable from the Plane server.

CVSS severity8.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Plane before 1.2.3 allows remote authenticated users to read internal HTTP responses through workspace webhooks. The URL serializer in plane/app/serializers/webhook.py rejects only loopback addresses, then the server fetches other private and link-local targets and records their full response bodies. Workspace ADMIN access and a triggered webhook event are required; exposed data is limited to services reachable from the Plane server.

The record

CVE
CVE-2026-30242
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Plane
Product
Plane
Classifications
CWE-918, T1046, T1552.005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Plane · Planeversion=< 1.2.3

Published CVSS scores

8.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
8.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery
T1552.005Unsecured Credentials: Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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