Wagtail: Improper escaping of HTML (Cross-site Scripting) on TableBlock class attributes
Wagtail is an open source content management system built on Django. Prior to versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1, a stored cross-site scripting (XSS) vulnerability exists on rendering TableBlock blocks within a StreamField. A user with access to create or edit pages containing TableBlock StreamField blocks is able to set specially-crafted class attributes on the block which run arbitrary JavaScript code when the page is viewed. When viewed by a user with higher privileges, this could lead to performing actions with that user's credentials. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin, and only affects sites using TableBlock. This issue has been patched in versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-28222
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 03:58 UTC · Revision 1
Source evidence
Wagtail: Improper escaping of HTML (Cross-site Scripting) on TableBlock class attributes
core-osv · Original sourcePublished 5 Mar 2026, 18:58 UTC
Wagtail is an open source content management system built on Django. Prior to versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1, a stored cross-site scripting (XSS) vulnerability exists on rendering TableBlock blocks within a StreamField. A user with access to create or edit pages containing TableBlock StreamField blocks is able to set specially-crafted class attributes on the block which run arbitrary JavaScript code when the page is viewed. When viewed by a user with higher privileges, this could lead to performing actions with that user's credentials. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin, and only affects sites using TableBlock. This issue has been patched in versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1.
osv:CVE-2026-28222
Complete source record
{
"id": "5857591155900161de65fcf21b7948d7b80192555acaa4b99be34af573b5699a",
"url": "https://osv.dev/vulnerability/CVE-2026-28222",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Wagtail: Improper escaping of HTML (Cross-site Scripting) on TableBlock class attributes",
"summary": "Wagtail is an open source content management system built on Django. Prior to versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1, a stored cross-site scripting (XSS) vulnerability exists on rendering TableBlock blocks within a StreamField. A user with access to create or edit pages containing TableBlock StreamField blocks is able to set specially-crafted class attributes on the block which run arbitrary JavaScript code when the page is viewed. When viewed by a user with higher privileges, this could lead to performing actions with that user's credentials. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin, and only affects sites using TableBlock. This issue has been patched in versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1.",
"evidence": "osv:CVE-2026-28222",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-28222",
"aliases": [
"CVE-2026-28222",
"GHSA-p5cm-246w-84jm",
"PYSEC-2026-2307"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"
}
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"range": [
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{
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"source": "CPE_STRING"
},
{
"range": [
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"source": "REFERENCES_COMMIT"
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{
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"source": "REFERENCES_COMMIT"
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{
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"source": "REFERENCES_TAG",
"original_tag": "v6.3.8"
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{
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],
"versions": [
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28222.json"
}
}
],
"modified": "2026-10-28T02:30:25.680640350Z",
"provider": "osv",
"references": [
"https://github.com/wagtail/wagtail/releases/tag/v6.3.8",
"https://github.com/wagtail/wagtail/releases/tag/v7.0.6",
"https://github.com/wagtail/wagtail/releases/tag/v7.2.3",
"https://github.com/wagtail/wagtail/releases/tag/v7.3.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28222.json",
"https://github.com/wagtail/wagtail/security/advisories/GHSA-p5cm-246w-84jm",
"https://nvd.nist.gov/vuln/detail/CVE-2026-28222",
"https://github.com/wagtail/wagtail/commit/0375094bb57ce6e527005c2bb2e871dd20bca04d",
"https://github.com/wagtail/wagtail/commit/4620423cb22c5253391a0f04178089c1162f6e2e",
"https://github.com/wagtail/wagtail/commit/575c0d7c18c7716ed73f7a3c2720ad75956f0a85",
"https://github.com/wagtail/wagtail/commit/605a5569686565e035313222e1bc2f9802fbc55b"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28222.json"
}
},
"related_cves": [
{
"value": "CVE-2026-28222",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492324,
"published_at": "2026-03-05T18:58:20.719+00:00"
}