CVE-2026-18526

HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation

Published Aug 19, 2026 CVSS 4.0 · 7.4 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation
First Time appeared Humhub
Humhub humhub
Weaknesses CWE-79
CPEs cpe:2.3:a:humhub:humhub:1.18.4:*:linux:*:*:*:*:*
cpe:2.3:a:humhub:humhub:1.18.4:*:macos:*:*:*:*:*
cpe:2.3:a:humhub:humhub:1.18.4:*:windows:*:*:*:*:*
Vendors & Products Humhub
Humhub humhub
References
Metrics cvssV4_0

{'score': 7.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Fluid Attacks
Published
Updated
Aug 21, 2026, 4:19 PM
Reserved
Jul 31, 2026, 7:46 PM
Status
Deferred
Published
Aug 19, 2026, 3:16 PM
Modified
Oct 27, 2026, 12:10 PM