osctrl has Stored Cross-Site Scripting (XSS) in On-Demand Query List

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

EPSS

• CVE-2026-28280: 0.27% estimated exploitation activity in the next 30 days; percentile 19.36 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A stored Cross-site Scripting (XSS) vulnerability exists in the osctrl-admin on-demand query list. A user with query-level permissions can inject arbitrary JavaScript via the query parameter when running an on-demand query. The payload is stored and executes in the browser of any user (including administrators) who visits the query list page. This can be chained with CSRF token extraction to escalate privileges and take actions as the logged in user. Impact An attacker with query-level permissions (the lowest privilege tier) can execute arbitrary JavaScript in the browsers of all users who view the query list. Depending on their level of access, it can lead to full platform compromise if an administrator executes the payload. Patches Fixed in osctrl v0.5.0. Users should upgrade immediately. Workarounds Restrict query-level permissions to trusted users. Monitor query list for suspicious payloads. Review osctrl user accounts for unauthorized administrators. References -…

Published by the source

28 Feb 2026, 02:07 UTC

Last modified by the source

2 Mar 2026, 15:22 UTC

Source last checked

26 Oct 2026, 15:15 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-4rv8-5cmm-2r22

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# Patch Next advisory brief: CVE-2026-28280

Advisory: osctrl has Stored Cross-Site Scripting (XSS) in On-Demand Query List
IDs: CVE-2026-28280, GHSA-4rv8-5cmm-2r22
Record: https://patchnext.com/advisories/cve-2026-28280 (revision 1, source checked 26 Oct 2026, 15:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/jmpsec/osctrl 0.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/jmpsec/osctrl: affected < 0.5.0; fixed in 0.5.0

## Suggested inspection (read-only)
- Go github.com/jmpsec/osctrl: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/jmpsec/osctrl.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4rv8-5cmm-2r22 (GitHub-reviewed advisory GHSA-4rv8-5cmm-2r22 lists affected ranges: Go github.com/jmpsec/osctrl >=0 <0.5.0)

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