CVE-2019-16966 [Medium] | XSS in Contactmanager

An issue was discovered in Contactmanager 13.x before 13.0.45.3, 14.x before 14.0.5.12, and 15.x before 15.0.8.21 for FreePBX 14.0.10.3. In the Contactmanager class (html\admin\modules\contactmanager\Contactmanager.class.php), an unsanitized group variable coming from the URL is reflected in HTML on 2 occasions, leading to XSS. It can be requested via a GET request to /admin/ajax.php?module=contactmanager.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-13	0.40%	0.33%	-0.06%
2	2025-03-30	0.46%	0.40%	-0.06%
3	2025-03-29	—	0.46%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-13

0.40%

0.33%

-0.06%

2025-03-30

0.46%

0.40%

-0.06%

2025-03-29

—

0.46%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2019-16966

Vendor	Product	Version	Raw CPE
freepbx	contactmanager	>= 13.0.2, < 13.0.45.3	cpe:2.3:a:freepbx:contactmanager::::::freepbx::*
freepbx	contactmanager	>= 14.0.1.1, < 14.0.5.12	cpe:2.3:a:freepbx:contactmanager::::::freepbx::*
freepbx	contactmanager	>= 15.0.2, < 15.0.8.21	cpe:2.3:a:freepbx:contactmanager::::::freepbx::*
freepbx	contactmanager	13.0.0	cpe:2.3:a:freepbx:contactmanager:13.0.0:beta1::::freepbx::*
freepbx	contactmanager	13.0.0	cpe:2.3:a:freepbx:contactmanager:13.0.0:beta2::::freepbx::*
freepbx	contactmanager	13.0.0	cpe:2.3:a:freepbx:contactmanager:13.0.0:beta3::::freepbx::*
freepbx	contactmanager	13.0.0	cpe:2.3:a:freepbx:contactmanager:13.0.0:beta4::::freepbx::*
freepbx	contactmanager	13.0.0	cpe:2.3:a:freepbx:contactmanager:13.0.0:beta5::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:-::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:alpha1::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:alpha2::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:beta1::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:beta2::::freepbx::*
freepbx	contactmanager	14.0.1	cpe:2.3:a:freepbx:contactmanager:14.0.1:beta3::::freepbx::*
sangoma	freepbx	14.0.10.3	cpe:2.3:a:sangoma:freepbx:14.0.10.3:::::::*

References for CVE-2019-16966

URL	Tags
https://github.com/FreePBX/contactmanager/commit/99e5aa0050224289cfe64c9036f38ce2531bf633	Patch Third Party Advisory
https://issues.freepbx.org/browse/FREEPBX-20437	Vendor Advisory
https://resp3ctblog.wordpress.com/2019/10/19/freepbx-xss-1/	Patch Vendor Advisory

URL

CVE-2019-16966

Exploit prediction scoring system (EPSS) score for CVE-2019-16966

Common vulnerability scoring system (CVSS) metrics for CVE-2019-16966

Weakness enumeration for CVE-2019-16966

Affected software / configurations for CVE-2019-16966

References for CVE-2019-16966