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CVE-2026-90583— kagisearch smallweb Query String Rendering sw.py index cross site scripting

Quick assessment

Affected
kagisearch smallweb
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.

在 kagisearch smallweb（截至 commit 0ecb9c48edbf98dc7e934b54fbac43869e64b4cf）中发现了一个安全漏洞。受影响的组件是 Query String Rendering 中 app/sw.py 文件里的 index 函数。通过操纵参数 可触发跨站脚本攻击（XSS），且该攻击可远程实施。 由于该产品采用滚动发布策略以实现持续交付，因此无法明确指出受影响的版本或修复版本的详细信息。修复补丁的标识为 00b68144e583f20a6b67e29cf01bc07

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-90583

Vulnerability Information
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Vulnerability Title
kagisearch smallweb Query String Rendering sw.py index cross site scripting
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in kagisearch smallweb up to 0ecb9c48edbf98dc7e934b54fbac43869e64b4cf. The affected element is the function index of the file app/sw.py of the component Query String Rendering. Performing a manipulation of the argument qs results in cross site scripting. The attack is possible to be carried out remotely. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The patch is named 00b68144e583f20a6b67e29cf01bc07f57979ffb. It is recommended to apply a patch to fix this issue. Exploitability requires a raw HTTP request carrying unencoded double-quote characters in the query string - Werkzeug's request.query_string returns the raw request-target, and ordinary browsers percent-encode " as %22, so the payload only lands via netcat/curl-style raw sockets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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
kagisearch smallweb 0ecb9c48edbf98dc7e934b54fbac43869e64b4cf cpe:2.3:a:kagisearch:smallweb:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-90583

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III. Intelligence Information for CVE-2026-90583

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Proof of Concept for CVE-2026-90583 (2)

IV. Related Vulnerabilities

Same vendor: kagisearch
Same weakness: CWE-79

V. Comments for CVE-2026-90583

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