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CVE-2017-9781

21
FAUCET Score

CVE-2017-9781 describes a cross-site scripting (XSS) vulnerability in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject malicious HTML or JavaScript. This medium-severity vulnerability (CVSS 6.1) can be exploited by manipulating the _username parameter during authentication attempts to webapi.py, leading to client-side code execution with low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.4.0CPE matchmatch criteria
cpe:2.3:a:check_mk_project:check_mk:1.4.0:*:*:*:*:*:*:*
1.4.0CPE matchmatch criteria
cpe:2.3:a:check_mk_project:check_mk:1.4.0:p1:*:*:*:*:*:*
1.4.0CPE matchmatch criteria
cpe:2.3:a:check_mk_project:check_mk:1.4.0:p2:*:*:*:*:*:*
1.4.0CPE matchmatch criteria
cpe:2.3:a:check_mk_project:check_mk:1.4.0:p3:*:*:*:*:*:*
1.4.0CPE matchmatch criteria
cpe:2.3:a:check_mk_project:check_mk:1.4.0:p4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.56%
Probability of exploitation in next 30 days
EPSS Percentile
72.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0156 is in the 85th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (4)

lexmarkvendor investigatingvia llm_extracted
libreofficevendor investigatingvia llm_extracted
mitelvendor investigatingvia llm_extracted
postgresqlvendor investigatingvia llm_extracted

Vendor Advisories (4)

mitelllm-mitel-831f98aeb8d0054eMEDIUM

[R1] Check_MK Multisite Web UI Reflected XSS

Nov 2, 2017
postgresqlllm-postgresql-010902924f8767deMEDIUM

[R1] Check_MK Multisite Web UI Reflected XSS

Nov 2, 2017
lexmarkllm-lexmark-97a46a193fddd8d5MEDIUM

[R1] Check_MK Multisite Web UI Reflected XSS

Nov 2, 2017
libreofficellm-libreoffice-224a48fbc94a00ffMEDIUM

[R1] Check_MK Multisite Web UI Reflected XSS

Nov 2, 2017

References

git.mathias-kettner.de / git
tenable.com / security/research/tra-2017-21
ExploitThird Party Advisory