CVE-2026-18756

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Source

https://cve.org/CVERecord?id=CVE-2026-18756

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18756.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-18756

Published

2026-08-19T14:46:25Z

Modified

2026-08-30T03:31:05Z

Severity

7.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N CVSS Calculator

Summary

HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering

Details

HumHub Community Edition 1.18.4 contains a reflected cross-site scripting vulnerability in the Space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of space/membership/request-membership-form, lure an authenticated non-member into submitting the legitimate membership request form, and cause the server to return JavaScript containing attacker-controlled code.

Database specific

{
    "cna_assigner": "Fluid Attacks",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18756.json"
}

References

Affected packages

Git / github.com/humhub/humhub

Affected ranges

Type

GIT

Repo

https://github.com/humhub/humhub

Events

Introduced

3320c4140371b62d8694eeaf943e606d902f007a

Last Affected

3320c4140371b62d8694eeaf943e606d902f007a

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "1.18.4"
        },
        {
            "last_affected": "1.18.4"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

1.*

1.18.4

v1.*

v1.18.4

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18756.json"