CVE-2026-63303

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.1Exploit: None knownExposed: 0

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

A Path Traversal vulnerability exists in Quick.CMS through the URI path component of HTTP requests, where the server fails to normalize dot-dot-slash (../) sequences before resolving and serving the requested file. An authenticated attacker with admin privileges can use this vulnerability to read contents of files located in the sibling directory of the webroot via a crafted HTTP request containing ../ sequences in the URI.

The vendor assessed the likelihood of exploitation as very low and determined that a fix is not necessary.

CVSS v3
5.1
EG Score
5.1(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

Free shopping cart and content management system (CMS) - OpenSolution.org

https://opensolution.org/
generic

Vulnerabilities in Quick.CMS software | CERT Polska

https://cert.pl/en/posts/2026/07/CVE-2026-63301

Vendor Advisories for CVE-2026-63303(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 20× in last 7d / 84× 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.

  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-27 11:39 UTCEG score recompute
  3. 2026-08-27 11:39 UTCGHSA enrichment
  4. 2026-08-26 14:46 UTCEPSS rescore
  5. 2026-08-26 12:42 UTCEG score recompute
  6. 2026-08-26 12:42 UTCGHSA enrichment
  7. 2026-08-25 13:49 UTCEPSS rescore
  8. 2026-08-25 13:28 UTCGHSA enrichment
  9. 2026-08-24 14:29 UTCEG score recompute
  10. 2026-08-24 14:29 UTCGHSA enrichment
  11. 2026-08-23 15:30 UTCEG score recompute
  12. 2026-08-23 15:30 UTCGHSA enrichment
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-22 16:35 UTCEG score recompute
  15. 2026-08-22 16:35 UTCGHSA enrichment
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-21 17:39 UTCEG score recompute
  18. 2026-08-21 17:39 UTCGHSA enrichment
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-20 18:43 UTCGHSA enrichment
  21. 2026-08-19 19:47 UTCEG score recompute
  22. 2026-08-19 19:47 UTCGHSA enrichment
  23. 2026-08-19 17:04 UTCEPSS rescore
  24. 2026-08-18 20:33 UTCEG score recompute
  25. 2026-08-18 20:33 UTCGHSA enrichment
Show 65 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-17 21:37 UTCEG score recompute
  3. 2026-08-17 21:37 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 22:39 UTCEG score recompute
  6. 2026-08-16 22:39 UTCGHSA enrichment
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-15 23:43 UTCEG score recompute
  9. 2026-08-15 23:43 UTCGHSA enrichment
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-15 00:47 UTCGHSA enrichment
  12. 2026-08-14 01:51 UTCEG score recompute
  13. 2026-08-14 01:51 UTCGHSA enrichment
  14. 2026-08-13 22:00 UTCEPSS rescore
  15. 2026-08-13 02:55 UTCEG score recompute
  16. 2026-08-13 02:55 UTCGHSA enrichment
  17. 2026-08-12 13:51 UTCEPSS rescore
  18. 2026-08-12 04:00 UTCEG score recompute
  19. 2026-08-12 04:00 UTCGHSA enrichment
  20. 2026-08-11 05:04 UTCEG score recompute
  21. 2026-08-11 05:04 UTCGHSA enrichment
  22. 2026-08-11 00:00 UTCEPSS rescore
  23. 2026-08-10 06:08 UTCEG score recompute
  24. 2026-08-10 06:08 UTCGHSA enrichment
  25. 2026-08-09 13:47 UTCEPSS rescore
  26. 2026-08-09 07:12 UTCEG score recompute
  27. 2026-08-09 07:12 UTCGHSA enrichment
  28. 2026-08-08 16:37 UTCEPSS rescore
  29. 2026-08-08 08:17 UTCEG score recompute
  30. 2026-08-08 08:17 UTCGHSA enrichment
  31. 2026-08-07 09:21 UTCEG score recompute
  32. 2026-08-07 09:21 UTCGHSA enrichment
  33. 2026-08-06 13:47 UTCEPSS rescore
  34. 2026-08-06 10:25 UTCEG score recompute
  35. 2026-08-06 10:25 UTCGHSA enrichment
  36. 2026-08-05 19:17 UTCEPSS rescore
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 11:29 UTCEG score recompute
  39. 2026-08-05 11:29 UTCGHSA enrichment
  40. 2026-08-04 15:10 UTCEPSS rescore
  41. 2026-08-04 12:32 UTCEG score recompute
  42. 2026-08-04 12:32 UTCGHSA enrichment
  43. 2026-08-04 10:39 UTCEPSS rescore
  44. 2026-08-03 12:38 UTCGHSA enrichment
  45. 2026-08-02 13:37 UTCEG score recompute
  46. 2026-08-02 13:37 UTCGHSA enrichment
  47. 2026-08-02 02:27 UTCEPSS rescore
  48. 2026-08-01 14:41 UTCEG score recompute
  49. 2026-08-01 14:41 UTCGHSA enrichment
  50. 2026-08-01 04:16 UTCEPSS rescore
  51. 2026-07-31 15:45 UTCGHSA enrichment
  52. 2026-07-30 16:45 UTCEG score recompute
  53. 2026-07-30 16:45 UTCGHSA enrichment
  54. 2026-07-30 16:28 UTCEPSS rescore
  55. 2026-07-30 11:29 UTCEG score recompute
  56. 2026-07-30 11:29 UTCGHSA enrichment
  57. 2026-07-30 01:30 UTCEPSS rescore
  58. 2026-07-30 01:30 UTCEPSS rescore
  59. 2026-07-29 12:33 UTCGHSA enrichment
  60. 2026-07-28 13:37 UTCEG score recompute
  61. 2026-07-28 13:37 UTCGHSA enrichment
  62. 2026-07-28 12:29 UTCEG score recompute
  63. 2026-07-28 11:33 UTCEG score recompute
  64. 2026-07-28 11:06 UTCEG score recompute
  65. 2026-07-28 11:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-63303?
CVE-2026-63303 is a medium vulnerability published on July 28, 2026. A Path Traversal vulnerability exists in Quick.CMS through the URI path component of HTTP requests, where the server fails to normalize dot-dot-slash (../) sequences before resolving and serving the requested file. An authenticated attacker with admin privileges can use this vulnerability to read…
When was CVE-2026-63303 disclosed?
CVE-2026-63303 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63303 actively exploited?
CVE-2026-63303 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63303?
CVE-2026-63303 has a CVSS v3 base score of 5.1 (NVD).
How do I remediate CVE-2026-63303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63303, 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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