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Vulnerability record · CVE-2026-18526 · published 19 August 2026

CVE-2026-18526: Cross-site scripting vulnerability

HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.

7.4 CVSS 4.0 High EPSS 0.46% · top 62.7% CWE-79 · Cross-site scripting Deferred
7.4CVSS 4.0 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
28 Aug 2026Last modified by NVD

Description

HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://fluidattacks.com/advisories/greeicy
https://github.com/humhub/humhub
https://github.com/humhub/humhub/pull/8373

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-18526), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.