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Vulnerability record · CVE-2026-52539 · published 30 July 2026

CVE-2026-52539: Hard-coded credentials vulnerability

Outstatic CMS <= 2.1.9 contains a hardcoded JWT signing secret. When the OST_TOKEN_SECRET environment variable is not set, the application falls back to the default value which is publicly visible in the source code repository. An unauthenticated remote attacker can exploit this by forging JWT session tokens with arbitrary user data and full administrative permissions.

9.1 CVSS 3.1 Critical EPSS 0.53% · top 57.6% CWE-798 · Hard-coded credentials Deferred
9.1CVSS 3.1 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
31 Jul 2026Last modified by NVD

Description

Outstatic CMS <= 2.1.9 contains a hardcoded JWT signing secret. When the OST_TOKEN_SECRET environment variable is not set, the application falls back to the default value which is publicly visible in the source code repository. An unauthenticated remote attacker can exploit this by forging JWT session tokens with arbitrary user data and full administrative permissions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://github.com/avitorio/outstatic
https://github.com/avitorio/outstatic/blob/canary/packages/outstatic/src/utils/constants.ts

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Source: NIST National Vulnerability Database (record CVE-2026-52539), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.