What is CVE-2026-52539?

CVE-2026-52539 is a critical-severity vulnerability in N/a, classified under Use of Hard-coded Credentials. CVSS score: 9.1/10. Published 2026-07-30.

How severe is CVE-2026-52539?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in N/a

CVE-2026-52539

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.

EPSS: 0.003 (22.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

Frequently asked questions

What is CVE-2026-52539?: CVE-2026-52539 is a critical-severity vulnerability in N/a, classified under Use of Hard-coded Credentials. CVSS score: 9.1/10. Published 2026-07-30.
How severe is CVE-2026-52539?: Critical severity. CVSS v3 base score is 9.1 out of 10.