The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol.
The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol.
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q9v-wm8r-rcv5 https://hackerone.com/reports/1308147 https://github.com/nextcloud/mail/pull/5470 https://github.com/nextcloud/mail/commit/595234c0179fcd13941ad58af1df75f049566e6d
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