CVE-2021-32707

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.

• CWE-20
• CWE-200

• https://github.com/nextcloud/mail/pull/5189Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crhThird Party Advisory
• https://hackerone.com/reports/1215251Exploit, Third Party Advisory
• https://github.com/nextcloud/mail/pull/5189Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crhThird Party Advisory
• https://hackerone.com/reports/1215251Exploit, Third Party Advisory

Published

Jul 12, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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