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Full Read SSRF via Favicon Fetching in "Add Link" Feature

High
sriramveeraghanta published GHSA-jcc6-f9v6-f7jw Feb 25, 2026

Package

makeplane/plane

Affected versions

<1.2.1

Patched versions

1.2.2

Description

Summary

A Full Read Server-Side Request Forgery (SSRF) vulnerability has been identified in the "Add Link" feature. This flaw allows an authenticated attacker with general user privileges to send arbitrary GET requests to the internal network and exfiltrate the full response body. By exploiting this vulnerability, an attacker can steal sensitive data from internal services and cloud metadata endpoints.

Impact

  • Full Read SSRF: Ability to read the full HTTP/HTTPS response body from services within the internal network.
  • Exfiltration of Sensitive Data:
    • Cloud Metadata: Under certain conditions (e.g., environments not requiring custom headers), instance credentials and IAM roles can be stolen from metadata endpoints.
    • Internal Network Resources: Data theft from internal APIs or unauthenticated internal services (e.g., object storage).
  • Internal Reconnaissance: Identifying the status of hosts and ports within the isolated internal network.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVE ID

CVE-2026-27706

Weaknesses

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Learn more on MITRE.

Credits