Medium
Security advisory
Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-32707
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:46 UTC · Revision 1
Source evidence
Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.
osv:CVE-2021-32707
Complete source record
{
"id": "c0abfbe3c22e075a9fe12722fdd7a800fd25b8f4a439fc5f204f74111c542c4d",
"url": "https://osv.dev/vulnerability/CVE-2021-32707",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-32707",
"summary": "Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.",
"evidence": "osv:CVE-2021-32707",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-32707",
"aliases": [
"CVE-2021-32707",
"GHSA-xxp4-44xc-8crh"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/mail",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "c1c6274efb4d73de062c5b6e3da2b66f0788beb5"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.9.6"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v1.9.5",
"v1.9.4",
"v1.9.3",
"v1.9.2",
"v1.9.1",
"v1.9.0",
"v1.9.0-alpha3",
"v1.9.0-alpha2",
"v1.8.0",
"1.6.2",
"v1.7.0",
"v1.6.0",
"v1.5.0",
"v1.5.0-rc2",
"v1.5.0-rc1",
"v1.5.0-beta3",
"v1.5.0-beta2",
"v1.5.0-beta1",
"v1.5.0-alpha3",
"v1.4.0-rc1",
"v1.4.0-beta2",
"v1.4.0-beta1",
"nightly-20200513",
"nightly-20200506",
"nightly-20200427",
"nightly-20200423",
"v1.3.3",
"v1.3.2",
"v1.3.1",
"v1.3.0",
"v1.3.0-RC1",
"v1.3.0-beta3",
"v1.3.0-beta2",
"v1.1.2",
"v1.3.0-beta1",
"v1.1.1",
"v1.1.0",
"v1.0.0",
"nightly-20200115",
"v0.21.1",
"v0.21.0",
"v0.20.3",
"v0.20.2",
"v0.20.1",
"v0.20.0",
"v0.19.1",
"v0.19.0",
"v0.18.1",
"v0.18.0",
"v0.18.0-RC1",
"v0.17.0",
"v0.16.0",
"v0.15.5",
"v0.15.4",
"v0.15.3",
"v0.15.2",
"v0.15.1",
"v0.15.0",
"v0.14.0",
"v0.13.0",
"v0.11.0",
"v0.12.0",
"v0.12.0-RC3",
"v0.12.0-RC2",
"v0.12.0-beta5",
"v0.12.0-beta4",
"v0.12.0-beta2",
"v0.12.0-beta1",
"v0.12.0-alpha3",
"v0.10.0",
"v0.9.0",
"v0.8.3",
"v0.8.2",
"untagged-bd8a3cab1eb0022ec683",
"v0.8.1",
"v0.8.0",
"nightly-20180410",
"v0.8.0-beta1",
"v0.8.0-alpha1",
"v0.7.10",
"v0.7.9",
"v0.7.8",
"v0.7.7",
"v0.7.6",
"nightly-20171212",
"v0.7.5",
"nightly-20171127",
"v0.7.4",
"nightly-20170913",
"v0.7.3",
"v0.7.2",
"nightly-20170906",
"v0.7.1",
"nightly-20170831",
"nighly-20170831",
"v0.7.0",
"nightly-20170823",
"nightly-20170612",
"v0.6.2",
"nightly-20170117",
"nightly-20161218",
"nightly-20161208",
"nightly-20161202",
"v0.5.2",
"v0.5.1",
"v0.5.0",
"v0.4.4",
"v0.4.3",
"v0.4.2",
"v0.4.1",
"v0.4.0",
"v0.3.0",
"v0.2.0",
"v0.1.3",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32707.json"
}
}
],
"modified": "2026-10-20T10:54:42.435591467Z",
"provider": "osv",
"references": [
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh",
"https://github.com/nextcloud/mail/pull/5189",
"https://hackerone.com/reports/1215251"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-32707",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385940,
"published_at": "2021-07-12T19:15:10.227+00:00"
}