How severe is CVE-2026-7765?

CVE-2026-7765 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-7765 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-7765?

CVE-2026-7765 primarily affects Checkmk. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-7765?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-7765 have an EU (EUVD) identifier?

Yes. CVE-2026-7765 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35051.

When was CVE-2026-7765 published?

CVE-2026-7765 was published on 2026-06-08 and last updated on 2026-06-17.

CVE-2026-7765

CVE-2026-7765 is a medium-severity vulnerability in Checkmk with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35051
Weakness: CWE-863
Affected product: Checkmk
Published: 2026-06-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-7765?: 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.
How severe is CVE-2026-7765?: CVE-2026-7765 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-7765 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-7765?: CVE-2026-7765 primarily affects Checkmk. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-7765?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-7765 have an EU (EUVD) identifier?: Yes. CVE-2026-7765 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35051.
When was CVE-2026-7765 published?: CVE-2026-7765 was published on 2026-06-08 and last updated on 2026-06-17.

References

https://checkmk.com/werk/19815

Affected products (8)

cpe:2.3:a:checkmk:checkmk:2.5.0:-:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:p1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:p2:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:*

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