CVE-2026-18526
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
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.
Risk Assessment
Stored XSS may allow an attacker to inject malicious scripts that execute whenever other users view the page, potentially leading to data theft or account takeover.
Recommendation
It is recommended to update HumHub to a version that fixes this vulnerability and to implement proper sanitization of oEmbed content.
Other vulnerabilities in HumHub
See all- CVE-2026-93769High
HumHub 1.18.5 is affected by a stored cross-site scripting (XSS) vulnerability that allows any user holding the delegated, non-system-administrator Manage Users permission (admin_manage_users) to inject persistent HTML/JavaScript into a Profile Field Category title.
- CVE-2026-18430High
HumHub 1.18.4 contains a stored cross-site scripting (XSS) vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.
- CVE-2026-18756High
HumHub Community Edition 1.18.4 contains a reflected XSS vulnerability in the space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of the request-membership-form, lure an authenticated non-member into submitting the legitimate form, and cause the server to return JavaScript containing attacker-controlled code.
- CVE-2026-47657High
Vulnerability in HumHub (enterprise social network) allows any authenticated user to remove all members from any Space, regardless of their role. Missing access control in the member management controller.
Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS