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GHSA-c35q-vxrp-ph26

HighCVSS 8.5 / 10

Published May 13, 2026·Last modified May 13, 2026

Affected Components(0)

No affected components available

Description

Impact

Nautobot's Webhook data model and associated feature set could be configured by users with sufficient access to perform requests to various hosts and IP addresses that should not be permitted, allowing for various behaviors similar to server-side request forgery (SSRF).

Patches

Fixes are available in Nautobot v2.4.33 and v3.1.2.

In support of this fix, three new settings variables have been added to Nautobot:

WEBHOOK_ALLOWED_SCHEMES - By default new or updated Webhook records will be restricted to HTTP or HTTPS only, disallowing other schemes that may have been previously allowed. Administrators should audit existing Webhook records to identify any that are invalid, and either update/delete said records or customize WEBHOOK_ALLOWED_SCHEMES as appropriate.
WEBHOOK_ADDITIONAL_BLOCKED_NETWORKS - This can be used to specify additional IP networks that should be denied to Webhook sending, for example some deployments may wish to disallow RFC1918 addresses or even disallow all networks and carve out specific exemptions using the following setting.
WEBHOOK_ALLOWED_HOSTS - This can be used to provide an allow-list of specific hosts that would otherwise be blocked by any WEBHOOK_ADDITIONAL_BLOCKED_NETWORKS configuration.

Workarounds

Administrators should review which users have been granted add or change permissions for the Webhook data model, and should review currently defined Webhook records for safety and validity. Other than that, no specific workaround has been identified.

References

2.4.33 (<a href="https://github.com/nautobot/nautobot/commit/16aa4aa9796ab7a31c4d615ec945e1f16d8c77c4">patch</a>)
3.1.2 (<a href="https://github.com/nautobot/nautobot/commit/7324c8f0d8c7245fbc691e15d729adc2d2707d08">patch</a>)

Risk Scores

Base Score

8.5

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.

Threat Intelligence

7.8

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

EPSS

0.24%

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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High severity

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