XSS in Humhub
CVE-2026-29048
HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software, malicious scripts could be injected and executed in the context of the user's browser. This issue has been patched in version 1.18.1.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Humhub — versions 1.18.0, = 1.18.0
Weakness classification (CWE)
References
- github.com/humhub/humhub/security/advisories/GHSA-qxjh-478x-23gm (Vendor Advisory)
- github.com/humhub/humhub/pull/8039 (Patch, Issue Tracking)
- github.com/humhub/humhub/commit/bd06ab4c75f6c65295ee3e1ce3643437e8f9d10a (Patch)
- github.com/humhub/humhub/releases/tag/v1.18.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-29048?
- CVE-2026-29048 is a medium-severity vulnerability in Humhub, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-06.
- How severe is CVE-2026-29048?
- Medium severity. CVSS v3 base score is 6.1 out of 10.