6.3

CVE-2026-7765: checkmk gmbh checkmk Incorrect Authorization

CVSS: 6.3v4.0MediumAnalyzed
AliasesUBUNTU-CVE-2026-7765
Published 08-06-2026Last modified 08-06-2026
Open JSON

Vulnerability summary

CVE-2026-7765 is a medium (CVSS 6.3) Incorrect Authorization vulnerability in checkmk gmbh checkmk. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.9% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-06-2026
    PublishedVulnerability first disclosed.
  2. 08-06-2026
    Last modifiedVulnerability information updated.

Description

Incorrect authorization in the User Messages dashboard widget in Checkmk <2.5.0p5 causes the message-fetching endpoints to return the dashboard creator's messages rather than the viewer's, allowing an attacker who knows a valid public dashboard share token to read the issuer's personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

+0.13 pp

From 0.19% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Checkmk1 product
  • checkmk2.5.0 | 2.5.0:b1 | 2.5.0:b2 | 2.5.0:b3 | 2.5.0:p1 | 2.5.0:p2 | 2.5.0:p3 | 2.5.0:p4
Checkmk gmbh1 product
Ubuntu1 product
  • check-mkAll versions (No fix recorded)

3 vendors · 3 products

References

3 links