CVE-2026-52539
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductOutstatic CMS
PublishedJul 30, 2026
First seenJul 30, 2026
Weakness typeCWE-798Hard-coded credentials
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Outstatic CMS | v ≤ 2.1.9 | — |
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