XSS in Humhub
CVE-2026-18526
HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
EPSS exploit prediction
EPSS: 0.005 (37.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Humhub — versions 1.18.4
Weakness classification (CWE)
References
- fluidattacks.com/advisories/greeicy (third-party-advisory)
- github.com/humhub/humhub (product)
- github.com/humhub/humhub/pull/8373 (patch)