Horizon Alert
Summary of the vulnerability and why it matters
This advisory addresses a critical vulnerability in Penpot, an open-source design collaboration tool. The issue involves improper session management during user profile registration and team invitations, which could allow an unauthorized, registered user to gain control of another user's non-blocked profile without proper verification. While specific impact depends on your Penpot deployment and usage, this type of authentication bypass could have significant implications for data integrity and access control within collaborative design workflows.
- Unregistered users could hijack existing profiles.
- Confirms a serious weakness in user account control.
- Assess Penpot usage and confirm exposure.
Attack Path
How an attacker could exploit the issue
An attacker with access to an existing Penpot account could impersonate another user by exploiting how new invitations are processed. By crafting a specific invitation, an attacker could potentially hijack any non-blocked profile, leading to unauthorized access and control over design assets and team data.
- Attacker needs an existing user account.
- Invitation email matches any user's profile.
- Full account takeover and data manipulation.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, a registered user could potentially take over any non-blocked profile by exploiting an authentication vulnerability that bypasses password verification for profile registration. This could impact user accounts and sensitive information within the Penpot application.
- User accounts and profile data.
- Unverified invitation email matching.
- Unauthorized profile access and control.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Penpot, a collaborative design tool, could allow a registered user to take over non-blocked user profiles without password verification. Platform or infrastructure teams responsible for deploying and managing Penpot should initiate an inventory of all Penpot instances. Subsequently, they must identify which instances are externally reachable and business-critical to prioritize remediation efforts and engage accountable application owners or vendor management teams.
- Platform/App owners should manage this issue.
- Verify external reachability and business criticality.
- Plan remediation with accountable owners.
