CVE-2026-52539

9.1 criticalEPSS 0.5%

Critical (9.1). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.1 critical

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-31)
CWE: CWE-798
Published: 2026-07-30
Modified: 2026-07-31
Record from: the NVD, synced 2026-10-19

References

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

Check your stack JSON