CVE-2026-52539

CRITICAL 9.1CVE-2026-52539 · Published 30/07/2026 · updated 31/07/2026

In short

CVE-2026-52539 is a CRITICAL (CVSS 9.1) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.53%, higher than 44.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

avitorio/outstatic
avitorio/outstatic

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