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Vulnerability · Published Nov 3, 2026 · Assigned by Fluid Attacks

CVE-2026-115541HumHub 1.19.0 - Stored cross-site scripting in friendship confirmation

High 7.2

In plain English

A high-severity cross-site scripting in HumHub Community Edition from HumHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)7.2High
Exploit odds (30 days)0.4%top 65.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded display name into a modal through jQuery html(), causing attacker-controlled markup to execute in the victim's HumHub origin.

Affected products (as reported)

VendorProductVersions
HumHub HumHub Community Edition 0 – before 1.18.71.19.0 – before 1.19.1

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

References