How severe is CVE-2026-29052?

CVE-2026-29052 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-29052 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29052?

CVE-2026-29052 affects Humhub Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29052?

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

Does CVE-2026-29052 have an EU (EUVD) identifier?

Yes. CVE-2026-29052 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9787.

When was CVE-2026-29052 published?

CVE-2026-29052 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-29052

CVE-2026-29052 is a medium-severity vulnerability in Humhub Calendar with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.9
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9787
Weakness: CWE-79
Affected product: Humhub Calendar
Published: 2026-03-05
Last modified: 2026-06-17

Description

The Calendar module for HumHub enables users to create one-time or recurring events, manage attendee invitations, and efficiently track all scheduled activities. Prior to version 1.8.11, a Stored Cross-Site Scripting (XSS) vulnerability in the Event Types of the HumHub Calendar module impacts users viewing events created by an administrative account. This issue has been patched in version 1.8.11.

Frequently asked questions

What is CVE-2026-29052?: The Calendar module for HumHub enables users to create one-time or recurring events, manage attendee invitations, and efficiently track all scheduled activities. Prior to version 1.8.11, a Stored Cross-Site Scripting (XSS) vulnerability in the Event Types of the HumHub Calendar module impacts users viewing events created by an administrative account. This issue has been patched in version 1.8.11.
How severe is CVE-2026-29052?: CVE-2026-29052 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-29052 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29052?: CVE-2026-29052 affects Humhub Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29052?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29052 have an EU (EUVD) identifier?: Yes. CVE-2026-29052 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9787.
When was CVE-2026-29052 published?: CVE-2026-29052 was published on 2026-03-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:humhub:calendar:*:*:*:*:*:*:*:*

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