# CVE-2026-34576: Postiz SSRF in upload-from-url endpoint

Source: https://junglewise.ai/threats/cve-2026-34576-postiz-ssrf-in-upload-from-url-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-34576 · Severity: high · CVSS 7.7 · Published 2026-04-02

Postiz, an AI-powered social media scheduling tool, contains a security flaw in its image upload feature. An authorized user can trick the system into accessing private internal servers or cloud infrastructure metadata instead of public images. This could allow an attacker to steal sensitive cloud credentials, scan internal corporate networks, or access private databases, potentially leading to a broader breach of the organization's infrastructure.

Technologies: [Gitroom Postiz](https://junglewise.ai/threats/technologies/postiz). Vendors: [Gitroom](https://junglewise.ai/threats/vendors/gitroom).

## Quick answers

**Is CVE-2026-34576 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34576 being exploited in the wild.

**How severe is CVE-2026-34576?** High severity, with a CVSS score of 7.7, published 2 April 2026.

**Which products and versions are affected?** Gitroom Postiz < 2.21.3.

**Is there a fix for CVE-2026-34576?** A patch was published on 2026-03-29: Version 2.21.3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34576 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-34576?** Check whether you run Gitroom Postiz at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in the Postiz 'upload-from-url' endpoint due to insufficient validation of user-supplied URLs. The application uses axios.get() to fetch remote content but only performs a superficial check for image file extensions (e.g., .png, .jpg), which can be bypassed by appending a query string or fragment to the target URL. An authenticated attacker can exploit this to make requests to internal network resources, such as AWS/GCP/Azure metadata services or internal databases. The application then uploads the retrieved data to its storage and provides a download URL to the attacker, facilitating full data exfiltration. The vulnerability is resolved in version 2.21.3.

## Affected products

- gitroomhq Postiz < 2.21.3

## Timeline

- 2026-03-28: disclosed: Advisory received and verified by Postiz team
- 2026-03-29: patched: Version 2.21.3 released
- 2026-03-30: other: CVE identifier assigned
- 2026-04-02: advisory: Public advisory published

## References

- [https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3](https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3)
- [https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34](https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34)

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