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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Aug 22, 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 34× in last 7d / 188× 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 409 total refreshes for this CVE.

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

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 1% probability of exploitation in the next 30 days, which ranks it in the top 53.8% of all scored CVEs.
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.

Dependency Blast Radius

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