CVE-2026-55090

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Source
https://cve.org/CVERecord?id=CVE-2026-55090
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55090.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55090
Aliases
Published
2026-08-19T19:32:17Z
Modified
2026-10-28T02:30:47Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
Etherpad: Stored XSS in HTML export via unescaped attribute-pool values
Details

Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55090.json"
}
References

Affected packages

Git / github.com/ether/etherpad

Affected ranges

Type
GIT
Repo
https://github.com/ether/etherpad
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
67f7d914f4e40f7cfda229c4865386deeb3c3c2b
Fixed
86c56cf827dd6e5ff1b6cd3760f87adc47f58bb1
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "3.3.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "86c56cf827dd6e5ff1b6cd3760f87adc47f58bb1"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v3.3.0",
            "range": [
                {
                    "fixed": "67f7d914f4e40f7cfda229c4865386deeb3c3c2b"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

1.*
1.0
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.2.0
1.2.1
1.2.12
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.9
1.3.0
1.4.0
1.4.1
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
1.5.7
1.6.0
1.6.1
1.6.2
1.8.10
1.8.11
1.8.12
1.8.13
1.8.14
1.8.15
1.8.16
1.8.17
1.8.18
1.8.6
1.8.7
1.8.8
1.8.9
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.9.7
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.1.0
2.1.1
2.2.0
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.3.0
2.3.1
2.3.2
2.4.0
2.4.1
2.4.2
2.5.0
2.5.1
2.5.3
2.6.0
2.6.1
2.7.0
2.7.1
2.7.2
2.7.3
3.*
3.0.0
3.1.0
3.2.0
v1.*
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4
v1.9.5
v1.9.6
v1.9.7
v2.*
v2.0.0
v2.0.1
v2.0.2
v2.0.3
v2.1.0
v2.1.1
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.2.5
v2.2.6
v2.2.7
v2.3.0
v2.3.1
v2.3.2
v2.4.0
v2.4.1
v2.4.2
v2.5.0
v2.5.1
v2.5.3
v2.6.0
v2.6.1
v2.7.0
v2.7.1
v2.7.2
v2.7.3
v3.*
v3.0.0
v3.1.0
v3.2.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55090.json"