SSRF via webhook function

published 2025-09-03 14 mo ago modified 2026-10-19 20 d ago also GHSA-hj6f-7hp7-xg69 , EUVD-2025-26495

cvss: 2.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 2

packagist mautic/core 4.4.17, 5.2.8, 6.0.5

github.com/mautic/mautic@6084f6d commit
github.com/mautic/mautic@dc5bb14 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 14 mo ago (2025-09-03)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	2.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	2.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	mautic/core	>=4.4.0, <4.4.17 >=5.0.0-alpha, <5.2.8 >=6.0.0-alpha, <6.0.5	4.4.17 5.2.8 6.0.5

Affected products

Mautic Mautic

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

Sources

CVE List CVE-2025-9821
GitHub Advisory GHSA-hj6f-7hp7-xg69
NVD CVE-2025-9821

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.