CVE-2026-52539 — CRITICAL (9.1)

Q: How severe is CVE-2026-52539?

CVE-2026-52539 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-52539?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.

Vulnerability 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 Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-798

References

FAQ

What is CVE-2026-52539?

CVE-2026-52539 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 ...

How severe is CVE-2026-52539?

CVE-2026-52539 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-52539?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.