CVE-2026-29048: HumHub: XSS in Button component

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-06 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

humhub: 1.18.0

References

https://github.com/humhub/humhub/commit/bd06ab4c75f6c65295ee3e1ce3643437e8f9d10a
https://github.com/humhub/humhub/pull/8039
https://github.com/humhub/humhub/releases/tag/v1.18.1
https://github.com/humhub/humhub/security/advisories/GHSA-qxjh-478x-23gm

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