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High, CVSS 8.1amended

Filestash allows attackers to escalate privileges via sending a crafted request

CVE-2026-50891GHSA-rcqf-cpv9-g5jf

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/mickael-kerjean/filestash

    Affected
    <= 0.2.2-0.20260827111952-cbcd1e96ebc7
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
  • CVE-2026-50891: 0.33% estimated exploitation activity in the next 30 days; percentile 25.75 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Incorrect access control in the /admin/api/config component of Filestash v0.4.0 allows attackers to escalate privileges via sending a crafted request.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-rcqf-cpv9-g5jf

  2. Revision 1 · created ·

    Published from osv record GO-2026-6300

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-50891

Advisory: Filestash allows attackers to escalate privileges via sending a crafted request
IDs: CVE-2026-50891, GHSA-rcqf-cpv9-g5jf
Record: https://patchnext.com/advisories/cve-2026-50891 (revision 2, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/mickael-kerjean/filestash: affected <= 0.2.2-0.20260827111952-cbcd1e96ebc7

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

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/mickael-kerjean/filestash.
- 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://osv.dev/vulnerability/GO-2026-6300 (OSV record GO-2026-6300 lists affected ranges: Go github.com/mickael-kerjean/filestash >=0)
- Verified: https://github.com/advisories/GHSA-rcqf-cpv9-g5jf (GitHub-reviewed advisory GHSA-rcqf-cpv9-g5jf lists affected ranges: Go github.com/mickael-kerjean/filestash >=0 <=0.2.2-0.20260827111952-cbcd1e96ebc7)

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