CVE-2026-32096
📋 TL;DR
An unauthenticated Server-Side Request Forgery (SSRF) vulnerability in Plunk's SNS webhook handler allows attackers to make arbitrary HTTP GET requests from the server to any accessible host. This affects all Plunk deployments prior to version 0.7.0. Attackers could potentially access internal services or exfiltrate data.
💻 Affected Systems
- Plunk
📦 What is this software?
Plunk by Useplunk
⚠️ Risk & Real-World Impact
Worst Case
Attacker accesses internal AWS metadata service to obtain IAM credentials, leading to full AWS account compromise and data exfiltration.
Likely Case
Attacker probes internal network services, accesses sensitive internal APIs, or uses the server as a proxy for attacks against other systems.
If Mitigated
Limited to port scanning internal services if network segmentation and proper AWS IAM policies are in place.
🎯 Exploit Status
SSRF vulnerabilities are commonly exploited and require minimal technical skill to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.0
Vendor Advisory: https://github.com/useplunk/plunk/security/advisories/GHSA-xpqg-p8mp-7g44
Restart Required: Yes
Instructions:
1. Update Plunk to version 0.7.0 or later. 2. Restart the Plunk service. 3. Verify the fix by checking the version and testing the SNS webhook endpoint.
🔧 Temporary Workarounds
Disable SNS Webhook Handler
allTemporarily disable the vulnerable SNS webhook functionality until patching is possible.
Modify Plunk configuration to disable SNS webhook handling
Network Segmentation
allRestrict outbound HTTP traffic from the Plunk server to only necessary destinations.
Configure firewall rules to block outbound HTTP/HTTPS from Plunk server except to AWS SES endpoints
🧯 If You Can't Patch
- Implement strict network egress filtering to limit outbound HTTP requests from the Plunk server
- Deploy a web application firewall (WAF) with SSRF protection rules in front of Plunk
🔍 How to Verify
Check if Vulnerable:
Check if Plunk version is below 0.7.0 and SNS webhook endpoint is accessible.Check Version:
Check Plunk configuration or deployment manifest for version informationVerify Fix Applied:
Confirm Plunk version is 0.7.0 or higher and test that SNS webhook no longer accepts arbitrary URLs.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from Plunk server
- SNS webhook requests with non-AWS URLs
Network Indicators:
- HTTP traffic from Plunk server to unexpected internal or external destinations
SIEM Query:
source="plunk" AND (url_contains="http://" OR url_contains="https://") AND NOT url_contains="amazonaws.com"