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地图 / SVG filter primitives bypass remote image blocking, enabling email tracking without consent.

SVG filter primitives bypass remote image blocking, enabling email tracking without consent.

信息泄露 / 隐私侵犯 / #3486747

厂商
Nextcloud
严重程度
低危 · CVSS 4.3
赏金
—
弱点
隐私侵犯
研究员
@nullcathedral
披露日期
2026-04-20
资产
https://github.com/roundcube/roundcubemail
CVE
—

该报告还没有中文解读。

原文摘录

摘自原文(2785 字符中的一小部分)
When `allow_remote` is set to `false`, Roundcube's HTML sanitizer [https://github.com/roundcube/roundcubemail/blob/5162a0d9d7b05728500375611a2fb4fc55844c7c/program/lib/Roundcube/rcube_washtml.php](rcube_washtml) blocks external resources in `<img>`, `<image>`, and `<use>` tags by checking their …
原文中的代码
<!DOCTYPE html>
<html>
<head><title>Important Document</title></head>
<body>
<h1>Important Information</h1>
<p>Dear valued customer,</p>
<p>Please review the attached information carefully.</p>

<svg width="1" height="1" style="position:absolute;left:-9999px;">
  <defs>
    <filter id="t"> …

默认不展示报告全文。以上为简短摘录,完整复现过程请阅读原文。版权归研究员与 Nextcloud 所有。

时间线

  • 报告提交
  • 公开披露
阅读 HackerOne 原文 ↗作者 @nullcathedral · 版权归作者与 Nextcloud 所有

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