XSS in Steedos Steedos-Platform
CVE-2026-91922
Steedos Platform through 3.0.15-beta.47 contains a reflected cross-site scripting vulnerability in the anonymous /api/page/render endpoint that fails to properly escape query parameters in inline script elements. Attackers can craft malicious links with script-terminating sequences in the schemaApi or data parameters to execute arbitrary JavaScript in victim sessions and steal X-Auth-Token credentials.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/steedos/steedos-platform (product)
- github.com/steedos/steedos-platform/blob/044423a3f326d86cf17f0e45adcbd44d2d3b06… (technical-description)
- github.com/steedos/steedos-platform/blob/044423a3f326d86cf17f0e45adcbd44d2d3b06… (technical-description)
- github.com/steedos/steedos-platform/issues/8354 (issue-tracking)
- www.vulncheck.com/advisories/steedos-platform-through-3.0.15-beta.47-reflected-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91922?
- CVE-2026-91922 is a medium-severity vulnerability in Steedos Steedos-Platform, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-15.
- How severe is CVE-2026-91922?
- Medium severity. CVSS v3 base score is 6.1 out of 10.