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CVE-2026-18430

HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason

HIGH
7.2
CVSS Score
Published: August 19, 2026 at 03:52 PM UTC
Updated: October 27, 2026 at 11:10 AM UTC
1 product affected across 1 vendorHumHub

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Severity
HIGH7.2
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

HumHub 1.18.4 contains a stored cross-site scripting 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Third Party Advisory
Source: cverecord
https://fluidattacks.com/es/advisories/personajes
Patch
Source: cverecord
https://github.com/humhub/humhub/pull/8365
Product
Source: cverecord
https://github.com/humhub/humhub

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGHFluid Attacks
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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