CVE-2026-7186 [High] | XSS in Checkmk

Stored cross-site scripting in the URL dashboard widget in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows a user with dashboard editing permissions to store a URL with a dangerous URI scheme such as javascript: that executes scripts in other users' browsers when they view the dashboard.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	0.14%	+0.11%
2	2026-06-09	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

0.14%

+0.11%

2026-06-09

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.5	4.0	HIGH	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:L) Low privileges are required. User interaction (UI:A) User interaction is required in an active way. Vulnerable system confidentiality impact (VC:H) High confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:H) High integrity impact on the vulnerable system. Vulnerable system availability impact (VA:H) High availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:L) Limited integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems. Exploit maturity (threat) (E:X) Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked). Confidentiality requirement (CR:X) Not defined: insufficient information; scoring treats this like High (worst case). Integrity requirement (IR:X) Not defined: insufficient information; scoring treats this like High (worst case). Availability requirement (AR:X) Not defined: insufficient information; scoring treats this like High (worst case). Modified attack vector (MAV:X) Not defined: scoring uses the Base Attack Vector (AV). Modified attack complexity (MAC:X) Not defined: scoring uses the Base Attack Complexity (AC). Modified attack requirements (MAT:X) Not defined: scoring uses the Base Attack Requirements (AT). Modified privileges required (MPR:X) Not defined: scoring uses the Base Privileges Required (PR). Modified user interaction (MUI:X) Not defined: scoring uses the Base User Interaction (UI). Modified vulnerable system confidentiality impact (MVC:X) Not defined: scoring uses the Base VC metric. Modified vulnerable system integrity impact (MVI:X) Not defined: scoring uses the Base VI metric. Modified vulnerable system availability impact (MVA:X) Not defined: scoring uses the Base VA metric. Modified subsequent system confidentiality impact (MSC:X) Not defined: scoring uses the Base SC metric. Modified subsequent system integrity impact (MSI:X) Not defined: scoring uses the Base SI metric. Modified subsequent system availability impact (MSA:X) Not defined: scoring uses the Base SA metric. Safety (supplemental) (S:X) Not evaluated. Automatable (supplemental) (AU:X) Not evaluated. Recovery (supplemental) (R:X) Not evaluated. Value density (supplemental) (V:X) Not evaluated. Vulnerability response effort (supplemental) (RE:X) Not evaluated. Provider urgency (supplemental) (U:X) Not evaluated.	—	—	[email protected]
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/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:L) A normal user session is enough; they don’t have to be admin. 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.	2.3	2.7	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.5

4.0

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L): Exploitation conditions are straightforward and stable.
Attack requirements (AT:N): No additional preconditions are required beyond normal reachability.
Privileges required (PR:L): Low privileges are required.
User interaction (UI:A): User interaction is required in an active way.
Vulnerable system confidentiality impact (VC:H): High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H): High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H): High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N): No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:L): Limited integrity impact on subsequent systems.
Subsequent system availability impact (SA:N): No availability impact on subsequent systems.
Exploit maturity (threat) (E:X): Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X): Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X): Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X): Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X): Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X): Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X): Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X): Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X): Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X): Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X): Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X): Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X): Not evaluated.
Automatable (supplemental) (AU:X): Not evaluated.
Recovery (supplemental) (R:X): Not evaluated.
Value density (supplemental) (V:X): Not evaluated.
Vulnerability response effort (supplemental) (RE:X): Not evaluated.
Provider urgency (supplemental) (U:X): Not evaluated.

—

[email protected]

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/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:L): A normal user session is enough; they don’t have to be admin.
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.

2.3

2.7

[email protected]

OS Trackers for CVE-2026-7186

vendor	priority	summary	link
`ubuntu`	medium	CVE-2026-7186 medium priority: Ubuntu including 1 source packages (check-mk), 6 status rows across 6 suites (bionic, jammy, noble, questing, resolute, upstream): DNE 4, needs-triage 2.	https://ubuntu.com/security/CVE-2026-7186

Affected software / configurations for CVE-2026-7186

Vendor	Product	Version	Raw CPE
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:-::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b1::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b2::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b3::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b4::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b5::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b6::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b7::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:b8::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:i1::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p1::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p10::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p11::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p12::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p13::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p14::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p15::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p16::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p17::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p18::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p19::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p2::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p20::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p21::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p22::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p23::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p24::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p25::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p26::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p27::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p28::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p29::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p3::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p30::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p31::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p32::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p33::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p34::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p35::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p36::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p37::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p38::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p39::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p4::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p40::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p41::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p42::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p43::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p44::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p45::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p46::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p47::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p5::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p6::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p7::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p8::::::
checkmk	checkmk	2.2.0	cpe:2.3:a:checkmk:checkmk:2.2.0:p9::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:-::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b1::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b2::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b3::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b4::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b5::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:b6::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p1::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p10::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p11::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p12::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p13::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p14::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p15::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p16::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p17::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p18::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p19::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p2::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p20::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p21::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p22::::::
checkmk	checkmk	2.3.0	cpe:2.3:a:checkmk:checkmk:2.3.0:p23::::::

References for CVE-2026-7186

URL	Tags
https://checkmk.com/werk/17991	Vendor Advisory

URL

CVE-2026-7186 | Fix stored XSS in URL dashboard widget via dangerous URI schemes

Exploit prediction scoring system (EPSS) score for CVE-2026-7186

Common vulnerability scoring system (CVSS) metrics for CVE-2026-7186

Weakness enumeration for CVE-2026-7186

GitHub Security Advisory for CVE-2026-7186

OS Trackers for CVE-2026-7186

Affected software / configurations for CVE-2026-7186

References for CVE-2026-7186