High
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Type: advisorySources: OSV
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-1090
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:23 UTC · Revision 1
Source evidence
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
core-osv · Original sourcePublished 11 Mar 2026, 16:05 UTC
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.
osv:CVE-2026-1090
Complete source record
{
"id": "d4aeef93f86624ad440ef1aa2a0a69d904b133762f6baf8da20aab51b3394a4d",
"url": "https://osv.dev/vulnerability/CVE-2026-1090",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab",
"summary": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.",
"evidence": "osv:CVE-2026-1090",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-1090",
"aliases": [
"BIT-gitlab-2026-1090",
"CVE-2026-1090"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.com/gitlab-org/gitlab",
"type": "GIT",
"events": [
{
"introduced": "3d59f5643aa87ca1fc506bf1ad37262d8ca6b4d6"
},
{
"fixed": "4ff507582a71b3fee0ef5a34e7ab583281391758"
},
{
"introduced": "1010a9b2b769993080ce8399fd25e77c54e1ad1c"
},
{
"fixed": "5831acc89ce4c662f751bb062d1df3bcf2b8cb4e"
},
{
"introduced": "20fe49b575fedd2b8cadc2c0640178879854aeb3"
},
{
"fixed": "fcb80522240b3ea1821ac6c2d52b00159bcda5a6"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"range": [
{
"introduced": "10.6.0"
},
{
"fixed": "18.7.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "10.6.0"
},
{
"fixed": "18.7.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"range": [
{
"introduced": "18.8.0"
},
{
"fixed": "18.8.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.8.0"
},
{
"fixed": "18.8.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"range": [
{
"introduced": "18.9.0"
},
{
"fixed": "18.9.2"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.9.0"
},
{
"fixed": "18.9.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v18.9.0-ee",
"v18.8.1-ee",
"v18.8.3-ee",
"v18.8.0-ee"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1090.json"
}
}
],
"modified": "2026-10-30T10:31:00.314183391Z",
"provider": "osv",
"references": [
"https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/",
"https://gitlab.com/gitlab-org/gitlab/-/work_items/586478",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1090.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-1090",
"https://hackerone.com/reports/3502450"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitLab",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "10.6"
},
{
"fixed": "18.7.6"
},
{
"introduced": "18.8"
},
{
"fixed": "18.8.6"
},
{
"introduced": "18.9"
},
{
"fixed": "18.9.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "10.6"
},
{
"fixed": "18.7.6"
},
{
"introduced": "18.8"
},
{
"fixed": "18.8.6"
},
{
"introduced": "18.9"
},
{
"fixed": "18.9.2"
}
],
"source": "DESCRIPTION"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1090.json"
}
},
"related_cves": [
{
"value": "CVE-2026-1090",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496319,
"published_at": "2026-03-11T16:05:05.863+00:00"
}