Description
stoatchat versions before 0.15.0 fail to block the IPv6 unspecified address (::) in the SSRF blocklist, allowing unauthenticated attackers to bypass protections via the /proxy and /embed endpoints. Attackers can craft requests using IPv6 literal syntax to access services on the loopback interface and retrieve sensitive internal content.
Published: 2026-08-16
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

This vulnerability arises in stoatchat versions before 0.15.0 because the application fails to filter the IPv6 unspecified address (::) from its SSRF blocklist. An unauthenticated attacker can craft a request to the /proxy or /embed endpoints using IPv6 literal syntax to bypass this list and reach services exposed on the loopback interface. The outcome is the potential retrieval of sensitive internal content or exposure of internal services, a classic Server‑Side Request Forgery flaw classified as CWE‑918.

Affected Systems

Stoatchat (stoatchat) versions prior to 0.15.0 are affected.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate severity. Because the EPSS score is not available, the exact likelihood of exploitation cannot be quantified. The vulnerability is not listed in the CISA KEV catalog, but it can be leveraged by unauthenticated attackers to access internal server resources via the proxy and embed endpoints. The attack path requires only the ability to send crafted requests; no additional privileges or vulnerabilities are needed beyond the SSRF blocklist flaw.

Generated by OpenCVE AI on August 16, 2026 at 14:42 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade stoatchat to version 0.15.0 or later
  • If an upgrade cannot be performed immediately, block or filter all IPv6 address literals at the network or application gateway level for the /proxy and /embed endpoints
  • Adjust firewall rules or internal service configuration to prevent loopback access from the proxy interface

Generated by OpenCVE AI on August 16, 2026 at 14:42 UTC.

Tracking

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Advisories

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History

Sun, 16 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Stoatchat
Stoatchat stoatchat
Vendors & Products Stoatchat
Stoatchat stoatchat

Sun, 16 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Description stoatchat versions before 0.15.0 fail to block the IPv6 unspecified address (::) in the SSRF blocklist, allowing unauthenticated attackers to bypass protections via the /proxy and /embed endpoints. Attackers can craft requests using IPv6 literal syntax to access services on the loopback interface and retrieve sensitive internal content.
Title stoatchat before 0.15.0 SSRF via IPv6 unspecified address bypass
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N'}

Subscriptions

Stoatchat Stoatchat
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-16T13:14:05.977Z

Reserved: 2026-08-10T19:10:18.101Z

Link: CVE-2026-73058

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-16T14:16:55.370

Modified: 2026-08-16T14:16:55.370

Link: CVE-2026-73058

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-16T15:15:04Z

Weaknesses
  • CWE-918

    Server-Side Request Forgery (SSRF)