CVE-2026-55850

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Source

https://cve.org/CVERecord?id=CVE-2026-55850

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55850.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55850

Aliases

GHSA-wrcp-5v3v-3j6v

Published

2026-08-21T18:30:12Z

Modified

2026-10-28T02:31:00Z

Severity

5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Element Web: A malicious homeserver can inject HTML in Element Web using its homepage

Details

Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious homeserver can provide crafted HTML that Element Web renders on the homepage; the content security policy prevents JavaScript but not phishing HTML. This issue is fixed in version 1.12.22.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55850.json"
}

References

Affected packages

Git / github.com/element-hq/element-web

Affected ranges

Type

GIT

Repo

https://github.com/element-hq/element-web

Events

Introduced

Fixed

94636e8d4d9e7fe96d2d598456551f4847f3bbba

Fixed

7949980a7e3c7e397d7afe899ef1b0563c417b0e

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.12.22"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "7949980a7e3c7e397d7afe899ef1b0563c417b0e"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.12.22",
            "range": [
                {
                    "fixed": "94636e8d4d9e7fe96d2d598456551f4847f3bbba"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

Other

no-media-devices-release

v0.*

v0.1.2

v0.10.0

v0.10.0-rc.2

v0.12.0-rc.1

v0.12.1

v0.12.1-rc.1

v0.12.2

v0.14.3-rc.1

v0.15.0

v0.15.0-rc.1

v0.15.0-rc.2

v0.15.0-rc.3

v0.15.0-rc.4

v0.15.0-rc.5

v0.15.0-rc.6

v0.15.1

v0.15.4

v0.15.4-rc.1

v0.15.5

v0.15.5-rc.1

v0.16.0

v0.16.0-rc.1

v0.16.0-rc.2

v0.16.3

v0.16.3-rc.1

v0.16.3-rc.2

v0.17.8

v0.17.8-rc.1

v0.3.0

v0.4.0

v0.4.1

v0.5.0

v0.6.0

v0.6.1

v0.7.0

v0.7.1

v0.7.2

v0.7.3

v0.7.4

v0.7.4-r1

v0.7.5

v0.7.5-r1

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.9.2

v0.9.3

v1.*

v1.11.35-no-media-devices-hotfix

v1.11.68

v1.11.68-rc.0

v1.4.0

v1.4.0-rc.1

v1.4.0-rc.2

v1.4.1

v1.4.2

v1.4.2-rc.1

v1.5.10

v1.5.3

v1.7.0

v1.7.1

v1.7.11

v1.7.11-rc.1

v1.7.13

v1.7.13-rc.1

v1.7.14

v1.7.14-rc.1

v1.7.16

v1.7.16-rc.1

v1.7.2

v1.7.23

v1.7.23-rc.1

v1.7.30

v1.7.30-rc.1

v1.7.9

v1.7.9-rc.1

v1.9.5

v1.9.5-rc.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55850.json"