CVE-2026-54390
Unauthenticated SSR injection in JTL Shop 5.2.0–5.7.1; read DB creds; 5.4–5.7.1 webshell.
Is CVE-2026-54390 being exploited?
Not confirmed. CVE-2026-54390 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.60% probability of exploitation in the next 30 days.
How severe is CVE-2026-54390?
CVE-2026-54390 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-54390?
Not known from our data. No patch reference has been recorded for CVE-2026-54390, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-54390 affect?
CVE-2026-54390 affects JTL Shop 5.2.0-5.7.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54390?
Patch when available; rotate credentials; monitor for abuse.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Read DB credentials and encryption keys; 5.4–5.7.1 can write a webshell and execute commands.
Immediate action required
- affected>= 5.2.0 and < 5.4.0
- affected>= 5.4.0 and <= 5.7.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.