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CVE-2026-94456

postiz-app · Vulnerability

CVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-94456

Published

Postiz generates security-sensitive credentials using `Math.random()` instead of a cryptographically secure source. The same helper is used for OAuth access tokens, authorization codes, client secrets, organization API keys, and PKCE verifiers, meaning these credentials depend entirely on V8’s deterministic xorshift128+ PRNG state. An unauthenticated OAuth dynamic client registration endpoint exposes freshly generated client credentials, giving attackers enough consecutive PRNG output to reconstruct that internal state. Once recovered, they can deterministically derive past and future values produced by the same generator, potentially compromising credentials belonging to other users and organizations.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-94456

Published

postiz-app

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "GitroomHQ",
                    "product": "postiz-app",
                    "packageName": "postiz-app",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "2.4.0"
                        }
                    ],
                    "repo": "https://github.com/gitroomhq/postiz-app"
                }

Original source record · Cite this exact observation · Complete original publisher JSON