CVE-2026-54390

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-18. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

JTL Shop versions 5.2.0 through 5.7.1 contains a server-side template injection vulnerability that allows unauthenticated attackers to inject malicious template syntax due to unsanitized user-supplied input passed to the Smarty template engine. Attackers can exploit this flaw to read sensitive server-side values such as database credentials and encryption keys, and on versions 5.4.0 through 5.7.1, leverage registered Smarty modifiers including unserialize and file_get_contents to write a webshell to the web root and execute arbitrary commands as the web server user.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
25.7%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Jul 12, 2026
No patch confirmed yet.
generic

JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer | Advisories | VulnCheck

https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer
generic

Unauthenticated remote code execution in JTL Shop | Sansec

https://sansec.io/research/jtl-shop-ssti-rce
generic

Neu - JTL-Shop 5.7 - Aktuell 5.7.2 | Supportforum für JTL-Wawi, JTL-Shop, JTL-POS, JTL-WMS, JTL-eazyAuction und JTL-Connectoren von JTL-Software

https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/

Vendor Advisories for CVE-2026-54390(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 183× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 213 total refreshes for this CVE.

  1. 2026-07-23 03:19 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 05:17 UTCGHSA enrichment
  9. 2026-07-17 01:07 UTCGHSA enrichment
  10. 2026-07-16 20:58 UTCGHSA enrichment
  11. 2026-07-16 17:03 UTCEPSS rescore
  12. 2026-07-16 12:55 UTCGHSA enrichment
  13. 2026-07-16 08:56 UTCGHSA enrichment
  14. 2026-07-16 04:57 UTCGHSA enrichment
  15. 2026-07-16 00:58 UTCGHSA enrichment
  16. 2026-07-15 20:59 UTCGHSA enrichment
  17. 2026-07-15 16:57 UTCEPSS rescore
  18. 2026-07-15 16:57 UTCEPSS rescore
  19. 2026-07-15 16:48 UTCGHSA enrichment
  20. 2026-07-15 12:50 UTCGHSA enrichment
  21. 2026-07-15 07:47 UTCGHSA enrichment
  22. 2026-07-15 03:46 UTCGHSA enrichment
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-14 23:43 UTCGHSA enrichment
Show 75 more
  1. 2026-07-14 19:41 UTCGHSA enrichment
  2. 2026-07-14 15:19 UTCGHSA enrichment
  3. 2026-07-14 11:18 UTCGHSA enrichment
  4. 2026-07-14 06:48 UTCGHSA enrichment
  5. 2026-07-14 02:49 UTCGHSA enrichment
  6. 2026-07-13 22:50 UTCGHSA enrichment
  7. 2026-07-13 22:31 UTCEPSS rescore
  8. 2026-07-13 18:51 UTCGHSA enrichment
  9. 2026-07-13 14:52 UTCGHSA enrichment
  10. 2026-07-13 10:52 UTCGHSA enrichment
  11. 2026-07-13 06:51 UTCGHSA enrichment
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-13 02:39 UTCGHSA enrichment
  15. 2026-07-12 22:40 UTCGHSA enrichment
  16. 2026-07-12 18:41 UTCGHSA enrichment
  17. 2026-07-12 14:40 UTCGHSA enrichment
  18. 2026-07-12 10:41 UTCGHSA enrichment
  19. 2026-07-12 06:41 UTCGHSA enrichment
  20. 2026-07-12 05:46 UTCEPSS rescore
  21. 2026-07-12 02:42 UTCGHSA enrichment
  22. 2026-07-11 22:40 UTCGHSA enrichment
  23. 2026-07-11 18:40 UTCGHSA enrichment
  24. 2026-07-11 14:40 UTCGHSA enrichment
  25. 2026-07-11 10:41 UTCGHSA enrichment
  26. 2026-07-11 08:27 UTCEPSS rescore
  27. 2026-07-11 08:27 UTCEPSS rescore
  28. 2026-07-11 06:41 UTCGHSA enrichment
  29. 2026-07-11 02:42 UTCGHSA enrichment
  30. 2026-07-10 22:43 UTCGHSA enrichment
  31. 2026-07-10 18:30 UTCGHSA enrichment
  32. 2026-07-10 14:29 UTCGHSA enrichment
  33. 2026-07-10 09:54 UTCGHSA enrichment
  34. 2026-07-10 05:24 UTCGHSA enrichment
  35. 2026-07-10 01:10 UTCGHSA enrichment
  36. 2026-07-09 21:07 UTCGHSA enrichment
  37. 2026-07-09 19:10 UTCEPSS rescore
  38. 2026-07-09 19:10 UTCEPSS rescore
  39. 2026-07-09 17:08 UTCGHSA enrichment
  40. 2026-07-09 13:09 UTCGHSA enrichment
  41. 2026-07-09 09:04 UTCGHSA enrichment
  42. 2026-07-09 05:04 UTCGHSA enrichment
  43. 2026-07-09 01:05 UTCGHSA enrichment
  44. 2026-07-08 21:04 UTCGHSA enrichment
  45. 2026-07-08 17:05 UTCGHSA enrichment
  46. 2026-07-08 15:16 UTCEPSS rescore
  47. 2026-07-08 15:16 UTCEPSS rescore
  48. 2026-07-08 13:06 UTCGHSA enrichment
  49. 2026-07-08 07:50 UTCGHSA enrichment
  50. 2026-07-08 03:50 UTCGHSA enrichment
  51. 2026-07-07 23:51 UTCGHSA enrichment
  52. 2026-07-07 19:52 UTCGHSA enrichment
  53. 2026-07-07 13:46 UTCEPSS rescore
  54. 2026-07-07 13:46 UTCEPSS rescore
  55. 2026-07-07 13:36 UTCGHSA enrichment
  56. 2026-07-07 09:35 UTCGHSA enrichment
  57. 2026-07-07 05:35 UTCGHSA enrichment
  58. 2026-07-07 01:35 UTCGHSA enrichment
  59. 2026-07-06 21:34 UTCGHSA enrichment
  60. 2026-07-06 16:35 UTCGHSA enrichment
  61. 2026-07-06 16:27 UTCEPSS rescore
  62. 2026-07-06 16:27 UTCEPSS rescore
  63. 2026-07-06 12:16 UTCGHSA enrichment
  64. 2026-07-06 08:13 UTCGHSA enrichment
  65. 2026-07-06 04:08 UTCGHSA enrichment
  66. 2026-07-06 02:23 UTCEPSS rescore
  67. 2026-07-06 02:23 UTCEPSS rescore
  68. 2026-07-06 00:08 UTCGHSA enrichment
  69. 2026-07-05 20:05 UTCGHSA enrichment
  70. 2026-07-05 16:06 UTCGHSA enrichment
  71. 2026-07-05 12:07 UTCGHSA enrichment
  72. 2026-07-05 08:08 UTCGHSA enrichment
  73. 2026-07-05 04:09 UTCGHSA enrichment
  74. 2026-07-05 02:31 UTCEPSS rescore
  75. 2026-07-05 02:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-54390?
CVE-2026-54390 is a critical vulnerability published on June 18, 2026. JTL Shop versions 5.2.0 through 5.7.1 contains a server-side template injection vulnerability that allows unauthenticated attackers to inject malicious template syntax due to unsanitized user-supplied input passed to the Smarty template engine. Attackers can exploit this flaw to read sensitive…
When was CVE-2026-54390 disclosed?
CVE-2026-54390 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54390 actively exploited?
CVE-2026-54390 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54390?
CVE-2026-54390 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-54390?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54390, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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