High
Security advisory
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-48920
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:25 UTC · Revision 1
Source evidence
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
osv:CVE-2026-48920
Complete source record
{
"id": "ecbebfae1a483c22bb971feb46d7b615493513c27abc1944fa10a5253f446b6d",
"url": "https://osv.dev/vulnerability/CVE-2026-48920",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-48920",
"summary": "Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.",
"evidence": "osv:CVE-2026-48920",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-48920",
"aliases": [
"CVE-2026-48920",
"GHSA-mq58-m26g-46gp"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/jenkinsci/email-ext-plugin",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "1598902b58ddfa69d5763b62db609f864f57e2d8"
},
{
"introduced": "45cec755423fcd203c6dc643794e6da6b6d66fb9"
},
{
"last_affected": "45cec755423fcd203c6dc643794e6da6b6d66fb9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:jenkins:email_extension:*:*:*:*:*:jenkins:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "1925.v1598902b_58dd"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:jenkins:email_extension:1933.v45cec755423f:*:*:*:*:jenkins:*:*",
"range": [
{
"introduced": "1933.v45cec755423f"
},
{
"last_affected": "1933.v45cec755423f"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"1933.v45cec755423f",
"1925.v1598902b_58dd",
"1922.v5c93c9e80a_f9",
"1916.vc954a_f86ff21",
"1911.v19b_8e86f9815",
"1876.v28d8d38315b_d",
"1866.v14fa_6d201654",
"1861.vdb_d991590994",
"1855.vd9e491cb_de1e",
"1851.v2b_5345e6272d",
"1849.v6dd03b_f6e423",
"1844.v3ea_a_b_842374a_",
"1814.v404722f34263",
"1806.v856a_01a_fa_39a_",
"email-ext-2.105",
"email-ext-2.104",
"email-ext-2.103",
"email-ext-2.102",
"email-ext-2.101",
"email-ext-2.100",
"email-ext-2.99",
"email-ext-2.98",
"email-ext-2.97",
"email-ext-2.96",
"email-ext-2.95",
"email-ext-2.93",
"email-ext-2.92",
"email-ext-2.91",
"email-ext-2.90",
"email-ext-2.89",
"email-ext-2.88",
"email-ext-2.87",
"email-ext-2.86",
"email-ext-2.85",
"email-ext-2.84",
"email-ext-2.83",
"email-ext-2.82",
"email-ext-2.81",
"email-ext-2.80",
"email-ext-2.79",
"email-ext-2.78",
"email-ext-2.77",
"email-ext-2.76",
"email-ext-2.75",
"email-ext-2.74",
"email-ext-2.73",
"email-ext-2.72",
"email-ext-2.71",
"email-ext-2.69",
"email-ext-2.68",
"email-ext-2.67",
"email-ext-2.66",
"email-ext-2.65",
"email-ext-2.64",
"email-ext-2.63",
"email-ext-2.62",
"email-ext-2.61",
"email-ext-2.60",
"email-ext-2.59",
"email-ext-2.58",
"email-ext-2.57",
"email-ext-2.56",
"email-ext-2.55",
"email-ext-2.52",
"email-ext-2.51",
"email-ext-2.50",
"email-ext-2.49",
"email-ext-2.48",
"email-ext-2.47",
"email-ext-2.46",
"email-ext-2.45",
"email-ext-2.44",
"email-ext-2.43",
"email-ext-2.42",
"email-ext-2.41.2",
"email-ext-2.41",
"email-ext-2.40.2",
"email-ext-2.40",
"email-ext-2.39",
"email-ext-2.37.2",
"email-ext-2.37.1",
"email-ext-2.37",
"email-ext-2.35.1",
"email-ext-2.35",
"email-ext-2.34",
"email-ext-2.33",
"email-ext-2.32",
"email-ext-2.31",
"email-ext-2.30.2",
"email-ext-2.30.1",
"email-ext-2.30",
"email-ext-2.29",
"email-ext-2.27.1",
"email-ext-2.27",
"email-ext-2.25",
"email-ext-2.24.1",
"email-ext-2.24",
"email-ext-2.22",
"email-ext-2.21",
"email-ext-2.20",
"email-ext-2.19",
"email-ext-2.18",
"email-ext-2.17",
"email-ext-2.16",
"email-ext-2.15",
"email-ext-2.14",
"email-ext-2.13",
"email-ext-2.12",
"email-ext-2.11"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48920.json"
}
}
],
"modified": "2026-10-24T10:30:53.122974402Z",
"provider": "osv",
"references": [
"https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3705"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2026-48920",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437850,
"published_at": "2026-05-27T15:16:31.647+00:00"
}