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GHSA-vwq2-jx9q-9h9f

CriticalCVSS 9.1 / 10
Published Nov 10, 2025·Last modified Nov 17, 2025
Affected Components(0)

No affected components available

Description

SUMMARY

We have identified and verified an SSRF vulnerability where webhook URLs are not validated, allowing repository administrators to create webhooks targeting internal services, private networks, and cloud metadata endpoints.

AFFECTED COMPONENTS (VERIFIED)

  1. Webhook Creation (pkg/ssh/cmd/webhooks.go:125)
  2. Backend CreateWebhook (pkg/backend/webhooks.go:17)
  3. Backend UpdateWebhook (pkg/backend/webhooks.go:122)
  4. Webhook Delivery (pkg/webhook/webhook.go:97)

IMPACT

This vulnerability allows repository administrators to perform SSRF attacks, potentially enabling:

a) Cloud Metadata Theft - Access AWS/Azure/GCP credentials via 169.254.169.254 b) Internal Network Access - Target localhost and private networks (10.x, 192.168.x, 172.16.x) c) Port Scanning - Enumerate internal services via response codes and timing d) Data Exfiltration - Full HTTP responses stored in webhook delivery logs e) Internal API Access - Call internal admin panels and Kubernetes endpoints

PROOF OF CONCEPT

Simple example demonstrating localhost access:

ssh localhost webhook create my-repo http://127.0.0.1:8080/internal \
    --events push --active

then push to trigger.

Risk Scores
Base Score
9.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.

Threat Intelligence
8.3

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.34%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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