kagisearch smallweb Query String Rendering sw.py index cross site scripting
Published Sep 13, 2026
5.3
MEDIUMCVSS 4.0
EPSS 0.49%
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.
Affected products
-
- Version StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Kagisearch | Smallweb | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
1 other source (NVD) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
AV:N/AC:L/Au:N/C:N/I:P/A:N/E:ND/RL:OF/RC:C
1 other source (NVD) ▾
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Sep 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.49% (0.00486) | 39.63th | v5 (v2026.06.15) |
| Sep 14, 2026 | 0.28% (0.00282) | 20.59th | v5 (v2026.06.15) |
References (7)
- https://github.com/kagisearch/smallweb/ product
- https://github.com/kagisearch/smallweb/commit/00b68144e583f20a6b67e29cf01bc07f57979ffb patch
- https://github.com/kagisearch/smallweb/issues/854 exploitissue-tracking
- https://vuldb.com/cve/CVE-2026-90583 third-party-advisory
- https://vuldb.com/submit/913779 third-party-advisory
- https://vuldb.com/vuln/403168 vdb-entrytechnical-description
- https://vuldb.com/vuln/403168/cti signaturepermissions-required
| Link | Providers | Tags |
|---|---|---|
| https://github.com/kagisearch/smallweb/ | product | |
| https://github.com/kagisearch/smallweb/commit/00b68144e583f20a6b67e29cf01bc07f57979ffb | patch | |
| https://github.com/kagisearch/smallweb/issues/854 | exploitissue-tracking | |
| https://vuldb.com/cve/CVE-2026-90583 | third-party-advisory | |
| https://vuldb.com/submit/913779 | third-party-advisory | |
| https://vuldb.com/vuln/403168 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/403168/cti | signaturepermissions-required |
Change history (0)
No recorded changes yet.