What’s Vulnerable › Vulnerabilities

CVE-2026-18430: HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason

• Severity: high (CVSS 7.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-27
• Weakness: CWE-79

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 products

• humhub: 1.18.4

References

• https://fluidattacks.com/es/advisories/personajes
• https://github.com/humhub/humhub
• https://github.com/humhub/humhub/pull/8365
• https://fluidattacks.com/es/advisories/personajes

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