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
48%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Sep 13, 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 5.7.3 | 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 10× in last 7d / 53× 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 436 total refreshes for this CVE.

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

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 52.4% 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

Explore the affected products and dependency analysis for CVE-2026-54390

Explore →

Is Your Infrastructure Affected by CVE-2026-54390?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs