CVE-2026-18430

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.

CVSS 4.0

7.2CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-26)

CWE

CWE-79

Published

2026-08-19

Modified

2026-10-27

Record from

the NVD, synced 2026-10-27

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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