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CVE-2026-121627— buku 5.0 through 5.1.1 Stored XSS via bukuserver Bookmark List URL

Quick assessment

Affected

jarun buku

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.

buku 5.0 至 5.1.1 版本在 bukuserver 的书签列表中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞位于 BookmarkModelView._list_entry() 方法中，攻击者可通过提交包含未转义的双引号和事件处理器的书签 URL，利用未认证的 /api/bookmarks 端点注入恶意脚本。一旦触发，攻击者能够以浏览者的身份发起同源 API 请求，从而窃取或滥用其凭证。

CVSS 6.1 · Medium EPSS 0.19% · P9 Updated Nov 04, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
jarun	buku	`5.0≤ 5.1.1`	affected

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Vulnerability Information

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Vulnerability Title

buku 5.0 through 5.1.1 Stored XSS via bukuserver Bookmark List URL

Source: CVE Program / CVE List V5

Vulnerability Description

buku 5.0 through 5.1.1 contains a stored cross-site scripting vulnerability in the bukuserver bookmark list that allows attackers to execute script via an unescaped bookmark URL in BookmarkModelView._list_entry(). Attackers can submit a URL containing a double quote and event handler through the unauthenticated /api/bookmarks endpoint to issue same-origin API requests with viewers' credentials.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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
jarun	buku	5.0 ~ 5.1.1	-

II. Public POCs for CVE-2026-121627

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-121627

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Other References for CVE-2026-121627 (4)

https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133 technical-description
https://github.com/jarun/buku product
https://github.com/jarun/buku/issues/911 issue-tracking
https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-url third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121627

Same Patch Batch · jarun · 2026-11-03 · 4 CVEs total

CVE-2026-121548	7.8 HIGH	nnn through 5.3 OS Command Injection via togglex Plugin
CVE-2026-121549	4.4 MEDIUM	nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins
CVE-2026-121550	3.3 LOW	nnn through 5.3 Symlink-Following Write via NNN_FIFO Handling

IV. Related Vulnerabilities

Same vendor: jarun

Same weakness: CWE-79