CVE Intelligence
Medium Cross-site scripting

CVE-2026-8078 — Fix stored XSS in global settings change log

Stored cross-site scripting in the global settings change log in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.

Published Jun 8, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Checkmk

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+2
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.24%
ahead of 14% of scored CVEs · Oct 14, 2026
Affects
Checkmk
Checkmk
CVSS base
4.8
Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Checkmk Checkmk).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  4. Search available logs for exploit probes matching the vulnerability class (cross-site scripting), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Checkmk Checkmk version 2.5.0-b1version 2.4.0-p29version 2.4.0-p3version 2.4.0-p30version 2.4.0-p4version 2.4.0-p5version 2.4.0-p6version 2.4.0-p7
and 148 more version 2.4.0-p8version 2.4.0-p9version 2.5.0version 2.4.0-p28version 2.5.0-b2version 2.5.0-b3version 2.5.0-p1version 2.5.0-p2version 2.5.0-p3version 2.5.0-p4version 2.4.0-p19version 2.4.0-p1version 2.4.0-p10version 2.4.0-p11version 2.4.0-p12version 2.4.0-p13version 2.4.0-p14version 2.4.0-p15version 2.4.0-p16version 2.4.0-p17version 2.4.0-p18version 2.4.0-b6version 2.4.0-p2version 2.4.0-p20version 2.4.0-p21version 2.4.0-p22version 2.4.0-p23version 2.4.0-p24version 2.4.0-p25version 2.4.0-p26version 2.4.0-p27version 2.2.0version 2.2.0-b1version 2.2.0-b2version 2.2.0-b3version 2.2.0-b4version 2.2.0-b5version 2.2.0-b6version 2.2.0-b7version 2.2.0-b8version 2.2.0-i1version 2.2.0-p1version 2.2.0-p10version 2.2.0-p11version 2.2.0-p12version 2.2.0-p13version 2.2.0-p14version 2.2.0-p15version 2.2.0-p16version 2.2.0-p17version 2.2.0-p18version 2.2.0-p19version 2.2.0-p2version 2.2.0-p20version 2.2.0-p21version 2.2.0-p22version 2.2.0-p23version 2.2.0-p24version 2.2.0-p25version 2.2.0-p26version 2.2.0-p27version 2.2.0-p28version 2.2.0-p29version 2.2.0-p3version 2.2.0-p30version 2.2.0-p31version 2.2.0-p32version 2.2.0-p33version 2.2.0-p34version 2.2.0-p35version 2.2.0-p36version 2.2.0-p37version 2.2.0-p38version 2.2.0-p39version 2.2.0-p4version 2.2.0-p40version 2.2.0-p41version 2.2.0-p42version 2.2.0-p43version 2.2.0-p44version 2.2.0-p45version 2.2.0-p46version 2.2.0-p47version 2.2.0-p5version 2.2.0-p6version 2.2.0-p7version 2.2.0-p8version 2.2.0-p9version 2.3.0version 2.3.0-b1version 2.3.0-b2version 2.3.0-b3version 2.3.0-b4version 2.3.0-b5version 2.3.0-b6version 2.3.0-p1version 2.3.0-p10version 2.3.0-p11version 2.3.0-p12version 2.3.0-p13version 2.3.0-p14version 2.3.0-p15version 2.3.0-p16version 2.3.0-p17version 2.3.0-p18version 2.3.0-p19version 2.3.0-p2version 2.3.0-p20version 2.3.0-p21version 2.3.0-p22version 2.3.0-p23version 2.3.0-p24version 2.3.0-p25version 2.3.0-p26version 2.3.0-p27version 2.3.0-p28version 2.3.0-p29version 2.3.0-p3version 2.3.0-p30version 2.3.0-p31version 2.3.0-p32version 2.3.0-p33version 2.3.0-p34version 2.3.0-p35version 2.3.0-p36version 2.3.0-p37version 2.3.0-p38version 2.3.0-p39version 2.3.0-p4version 2.3.0-p40version 2.3.0-p41version 2.3.0-p42version 2.3.0-p43version 2.3.0-p44version 2.3.0-p45version 2.3.0-p46version 2.3.0-p47version 2.3.0-p5version 2.3.0-p6version 2.3.0-p7version 2.3.0-p8version 2.3.0-p9version 2.4.0version 2.4.0-b1version 2.4.0-b2version 2.4.0-b3version 2.4.0-b4version 2.4.0-b5
Vulnerable NIST National Vulnerability Database
Checkmk Checkmk ≥ 2.5.0 and < 2.5.0p5≥ 2.4.0 and < 2.4.0p31≥ 2.3.0 and < 2.3.0p48version 2.2.0 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
4.8 CVSS 4.0 Medium — — security@checkmk.com via NIST National Vulnerability Database
4.8 CVSS 4.0 Medium — — Checkmk via CVE Program (cve.org) e CISA ADP
4.8 CVSS 3.1 Medium 1.7 2.7 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-79 · Cross-site Scripting (XSS)

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.24%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor CSP violation reports and script payloads in reflected parameters.
web/proxy/WAF logsnetwork IDS/IPSapplication logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · checkmk gmbh/checkmk
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • CVSS changed · 4.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    Jun 8, 2026 · Checkmk

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

Elsewhere on this site

Checkmk
every CVE for this vendor
Cross-site scripting
same class
CWE-79
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-105331 mk-oracle: Local privilege escalation via malicious Oracle Instant Client 7d
  • CVE-2026-9549 Fix XSS in service discovery active check output Jun 8, 2026
  • CVE-2026-7765 User Messages widget leaked issuer messages on shared dashboards Jun 8, 2026
  • CVE-2026-8833 XSS in urls Jun 8, 2026
  • CVE-2026-7186 Fix stored XSS in URL dashboard widget via dangerous URI schemes Jun 8, 2026
  • CVE-2024-47091 Privilege escalation via mk_mysql agent plugin on Windows May 13, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-8078 is "Fix stored XSS in global settings change log", rated Medium. It affects Checkmk (Checkmk); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.8 describes technical severity. EPSS 0.24% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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