CVE-2019-15006 [Medium] | Security Vulnerability in Confluence

There was a man-in-the-middle (MITM) vulnerability present in the Confluence Previews plugin in Confluence Server and Confluence Data Center. This plugin was used to facilitate communication with the Atlassian Companion application. The Confluence Previews plugin in Confluence Server and Confluence Data Center communicated with the Companion application via the atlassian-domain-for-localhost-connections-only.com domain name, the DNS A record of which points at 127.0.0.1. Additionally, a signed certificate for the domain was publicly distributed with the Companion application. An attacker in the position to control DNS resolution of their victim could carry out a man-in-the-middle (MITM) attack between Confluence Server (or Confluence Data Center) and the atlassian-domain-for-localhost-connections-only.com domain intended to be used with the Companion application. This certificate has been revoked, however, usage of the atlassian-domain-for-localhost-connections-only.com domain name was still present in Confluence Server and Confluence Data Center. An attacker could perform the described attack by denying their victim access to certificate revocation information, and carry out a man-in-the-middle (MITM) attack to observe files being edited using the Companion application and/or modify them, and access some limited user information.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	7.64%	1.91%	-5.73%
2	2026-03-26	2.18%	7.64%	+5.46%
3	2026-03-04	—	2.18%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

7.64%

1.91%

-5.73%

2026-03-26

2.18%

7.64%

+5.46%

2026-03-04

—

2.18%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	2.2	4.2	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

2.2

4.2

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

4.9

[email protected]

Affected software / configurations for CVE-2019-15006

Vendor	Product	Version	Raw CPE
atlassian	confluence	>= 6.11.0, < 6.13.10	cpe:2.3:a:atlassian:confluence::::::::
atlassian	confluence_server	>= 6.14.0, < 6.15.10	cpe:2.3:a:atlassian:confluence_server::::::::
atlassian	confluence_server	>= 7.0.1, < 7.0.5	cpe:2.3:a:atlassian:confluence_server::::::::
atlassian	confluence_server	>= 7.1.0, < 7.1.2	cpe:2.3:a:atlassian:confluence_server::::::::

References for CVE-2019-15006

URL	Tags
http://packetstormsecurity.com/files/155742/Atlassian-Confluence-Man-In-The-Middle.html	Third Party Advisory VDB Entry
https://confluence.atlassian.com/doc/confluence-security-advisory-2019-12-18-982324349.html	Patch Vendor Advisory
https://jira.atlassian.com/browse/CONFSERVER-59244	Patch Vendor Advisory
https://seclists.org/bugtraq/2019/Dec/36	Mailing List Third Party Advisory
https://twitter.com/SwiftOnSecurity/status/1202034106495832067	Issue Tracking Third Party Advisory

URL

CVE-2019-15006

Exploit prediction scoring system (EPSS) score for CVE-2019-15006

Common vulnerability scoring system (CVSS) metrics for CVE-2019-15006

Weakness enumeration for CVE-2019-15006

Affected software / configurations for CVE-2019-15006

References for CVE-2019-15006