VulnerabilityDeferred

CVE-2026-18430

HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow.

HIGH 7.2EPSS 0.37%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 4.0: 7.2 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.37% probability · 30th percentile
CISA KEV: Not listed
Weakness: CWE-79
Source: help@fluidattacks.com

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.