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CVE-2026-55696— PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction

Quick assessment

Affected
PrivateBin PrivateBin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PrivateBin 是一个在线粘贴板服务，其服务器对粘贴的数据没有任何了解（即零知识）。在 2.0.5 版本之前， 中的 函数使用 接受由攻击者控制的 MIME 类型，并通过 创建同源的 blob 对象，然后将其设置为“下载”附件链接（ ）的 属性。由于 SVG 专用净化分支仅更新预览用的 blob，因此 、 、 和 类型的附件在下载用 blob 中仍可能保持“活动”状态（即可执行脚本）。 在一个启用了文件上传（ ），且内容安全策略（CSP）被削弱、被移除或缺失的实例上，匿名攻击者可以创建此类附件。当受害者在新标

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-55696

Vulnerability Information
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Vulnerability Title
PrivateBin: Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction
Source: CVE Program / CVE List V5
Vulnerability Description
PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, AttachmentViewer.setAttachment in js/privatebin.js uses getAttachmentMimeType to accept attacker-controlled MIME types and uses getBlobUrl to create a same-origin blob before setting attachmentLink's href for the Download attachment link. The SVG-only sanitization branch updates only the preview blob, so text/html, image/svg, application/xhtml+xml, and text/xml attachments can remain active in the download blob. On an instance with fileupload = true and a weakened, stripped, or absent Content Security Policy, an anonymous attacker can create such an attachment, and a victim who opens the link in a new tab causes inline JavaScript to execute in the PrivateBin origin. The script can read origin-scoped local storage and issue same-origin requests, including requests to applications co-hosted on the same domain. This issue is fixed in version 2.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PrivateBin PrivateBin < 2.0.5 -

II. Public POCs for CVE-2026-55696

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III. Intelligence Information for CVE-2026-55696

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Patches & Fixes for CVE-2026-55696 (2)

Vendor Advisories for CVE-2026-55696 (1)

IV. Related Vulnerabilities

Same product: PrivateBin
Same vendor: PrivateBin
Same weakness: CWE-79

V. Comments for CVE-2026-55696

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