CVE-2026-18756Disclosure

LOWCVSS 7.2 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

HumHub Community Edition 1.18.4 contains a reflected cross-site scripting vulnerability in the Space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of space/membership/request-membership-form, lure an authenticated non-member into submitting the legitimate membership request form, and cause the server to return JavaScript containing attacker-controlled code.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets2 URLs

By indicator

Full discourse1 post

Fluid Attacks@fluidattacks46d
Disclosure
🚨 New zero-day in HumHub | Detected by our AI SAST scanner and disclosed by Miguel Gómez. As a #CNA, we assigned the ID CVE-2026-18756. Details: 🔗 https://fluidattacks.com/advisories/turizo. We have announced 274 #CVEs to this date: 🔗 https://fluidattacks.com/advisories/. https://t.co/cdYH3ukoOC
Post summary
The tweet announces a new zero‑day CVE‑2026‑18756 in HumHub, providing the CVE ID and advisory links but no technical details, exploit code, patch, or evidence of active exploitation.
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900 followersView on X

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