by Kastro
Paper/Archive/CVE-2026-52539

CVE-2026-52539

mitre — Outstatic CMS <= 2.1.9 contains a hardcoded JWT signing secret.

EPSS 0.5%CVSS 9.1
critical.is priorityof 100
36
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 44.7.447 × 208.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
n/an/a–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/avitorio/outstatic/blob/canary/packages/outstatic/src/utils/constants.tsrefgithub.com/avitorio/outstatic