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CVE-2026-19264 – Unauthenticated Path Traversal (Arbitrary File Read) leading to Admin Takeover – Po

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Summary

CVE-2026-19264 is a critical, unauthenticated path traversal vulnerability in Postiz (gitroomhq/postiz-app), an open-source social media scheduling application. The flaw in Postiz’s media-serving route allows a remote attacker to read arbitrary files accessible to the application process, exposing secrets that enable full administrator account takeover. It is rated CVSS v3.1 9.8 (Critical).

Technical details

  • Root cause: The media-serving route (/uploads) joins URL-supplied path segments onto the upload directory and streams the resulting file without normalizing the path or confining it to the intended directory.
  • Trigger conditions: Raw dot-segments (../) are collapsed before route matching, but URL-encoded separators bypass this initial filtering and are decoded at the handler level, restoring traversal capability. Per the CVE record, this is exploitable when STORAGE_PROVIDER is set to local (the default in .env.example).
  • Attack vector: Network; no authentication or user interaction required (AV:N, PR:N, UI:N).
  • Impact: Arbitrary file read of any file accessible to the application process, including environment variables containing the JWT secret, database credentials, and provider tokens. Disclosure of the JWT signing secret allows an attacker to forge non-expiring administrator sessions.

Affected software

  • Postiz (gitroomhq/postiz-app): all versions from 0 up to and including 2.22.0 (i.e., versions before 2.22.1).

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to Postiz 2.22.1 or later, which contains the fix.
  • If no patch can be applied immediately: Restrict network access to the Postiz instance (e.g., place it behind authentication/VPN or a reverse-proxy allowlist), and rotate any secrets that may have been exposed (JWT signing secret, database credentials, and provider tokens). Where feasible, avoid the local storage provider configuration.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Postiz Register
  • Raw response body: Postiz To Grow Their Social Presence, "children": "Postiz Register"

References

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Map your entire attack surface (continously)

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Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

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Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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