CVE-2025-9821: SSRF via webhook function

Severity: low (CVSS 2.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-03 · updated 2026-10-19
Weakness: CWE-918

Description

SummaryUsers with webhook permissions can conduct SSRF via webhooks. If they have permission to view the webhook logs, the (partial) request response is also disclosed DetailsWhen sending webhooks, the destination is not validated, causing SSRF. ImpactBypass of firewalls to interact with internal services. See https://owasp.org/Top10/A10_2021-Server-Side_Request_Forgery_%28SSRF%29/ for more potential impact. Resources https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html for more information on SSRF and its fix.

Affected products

Mautic: from >= 4.4.0 through < 4.4.17; from >= 5.0.0-alpha through < 5.2.8; from >= 6.0.0-alpha through < 6.0.5

References

https://github.com/mautic/mautic/security/advisories/GHSA-hj6f-7hp7-xg69

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