EUVD-2026-77073
GHSA-4mhr-77m9-cfv9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H reflects the documented browser-encoding barrier preventing standard URL delivery; S:C captures XSS scope change into victim browser context.
Primary rating from Vendor (vuldb).
CVSS VectorVendor: vuldb
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Reflected XSS in Kagi Smallweb's query string rendering allows injection of JavaScript into HTML form action attributes across three server-rendered templates. Jinja2's |safe filter was applied to the raw Werkzeug request.query_string value in flag_panel.html, mobile_more.html, and reactions.html, bypassing auto-escaping when unencoded double-quote characters appear in the query string. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must send an HTTP request containing a literal unencoded double-quote character (ASCII 0x22) in the query string, which requires a raw-socket HTTP client such as netcat, curl with --path-as-is, or a custom script - standard web browsers (Chrome, Firefox, Safari, Edge) automatically percent-encode double-quotes as %22 before transmission, making link-based delivery to typical victims impossible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is materially lower than a surface-level XSS assessment suggests, despite the network-accessible attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The vendor-released fix is commit 00b68144e583f20a6b67e29cf01bc07f57979ffb, publicly available at https://github.com/kagisearch/smallweb/commit/00b68144e583f20a6b67e29cf01bc07f57979ffb. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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