Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite
Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55085
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 03:28 UTC · Revision 1
Source evidence
Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite
core-osv · Original sourcePublished 19 Aug 2026, 19:34 UTC
Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.
osv:CVE-2026-55085
Complete source record
{
"id": "9ec7610a20f2770fcfae4b726ce261cdf1655b76ffe8db09928753a4a1e13214",
"url": "https://osv.dev/vulnerability/CVE-2026-55085",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite",
"summary": "Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.",
"evidence": "osv:CVE-2026-55085",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-55085",
"aliases": [
"CVE-2026-55085",
"GHSA-f7h5-v9hm-548j"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/ether/etherpad",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "92e23bf7d40473b9116abd5cb9278f860ded0479"
},
{
"fixed": "d828185efcac9abc2e46e6da1c171393500fa319"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.3.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "d828185efcac9abc2e46e6da1c171393500fa319"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "92e23bf7d40473b9116abd5cb9278f860ded0479"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.3.1"
}
]
}
}
],
"versions": [
"v3.3.0",
"3.3.0",
"v3.2.0",
"3.2.0",
"v3.1.0",
"3.1.0",
"v3.0.0",
"3.0.0",
"v2.7.3",
"2.7.3",
"v2.7.2",
"2.7.2",
"v2.7.1",
"2.7.1",
"v2.7.0",
"2.7.0",
"v2.6.1",
"2.6.1",
"v2.6.0",
"2.6.0",
"v2.5.3",
"2.5.3",
"v2.5.1",
"2.5.1",
"v2.5.0",
"2.5.0",
"v2.4.2",
"2.4.2",
"v2.4.1",
"2.4.1",
"v2.4.0",
"2.4.0",
"v2.3.2",
"2.3.2",
"v2.3.1",
"2.3.1",
"v2.3.0",
"2.3.0",
"v2.2.7",
"2.2.7",
"v2.2.6",
"2.2.6",
"v2.2.5",
"2.2.5",
"v2.2.4",
"2.2.4",
"v2.2.3",
"2.2.3",
"v2.2.2",
"2.2.2",
"v2.2.1",
"2.2.1",
"v2.2.0",
"2.2.0",
"v2.1.1",
"2.1.1",
"v2.1.0",
"2.1.0",
"v2.0.3",
"2.0.3",
"v2.0.2",
"2.0.2",
"v2.0.1",
"2.0.1",
"v2.0.0",
"2.0.0",
"v1.9.7",
"1.9.7",
"v1.9.6",
"1.9.6",
"v1.9.5",
"1.9.5",
"v1.9.4",
"1.9.4",
"1.9.3",
"v1.9.3",
"1.9.2",
"v1.9.2",
"1.8.15",
"v1.9.1",
"1.9.1",
"v1.9.0",
"1.9.0",
"1.8.18",
"1.8.17",
"1.8.16",
"1.8.14",
"1.8.13",
"1.8.12",
"1.8.11",
"1.8.10",
"1.8.9",
"1.8.8",
"1.8.7",
"1.8.6",
"1.6.2",
"1.6.1",
"1.6.0",
"1.5.7",
"1.5.6",
"1.5.5",
"1.5.4",
"1.5.3",
"1.5.2",
"1.5.1",
"1.4.1",
"1.4.0",
"1.3.0",
"1.2.12",
"1.2.9",
"1.2.7",
"1.2.6",
"1.2.5",
"1.2.4",
"1.2.3",
"1.2.2",
"1.2.1",
"1.2.0",
"1.1.5",
"1.1.4",
"1.1.3",
"1.1.2",
"1.1.1",
"1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55085.json"
}
}
],
"modified": "2026-10-28T02:30:53.300953400Z",
"provider": "osv",
"references": [
"https://github.com/ether/etherpad/releases/tag/v3.3.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55085.json",
"https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55085",
"https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319",
"https://github.com/ether/etherpad/pull/7937"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55085.json"
}
},
"related_cves": [
{
"value": "CVE-2026-55085",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 522213,
"published_at": "2026-08-19T19:34:27.269+00:00"
}