CVE-2026-57311

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 51% 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: cna:cert-pl, epss
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

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

Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution.

Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 4.1 but may also affect other versions.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 29, 2026

Advisory Details (2)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic

Windu CMS - Polski system CMS do tworzenia stron www

https://windu.org
generic

Podatności w oprogramowaniu Windu CMS | CERT Polska

https://cert.pl/posts/2026/07/CVE-2026-57309

Vendor Advisories for CVE-2026-57311(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 / 58× 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 210 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-57311?
CVE-2026-57311 is a medium vulnerability published on July 20, 2026. Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 4.1 but may also affect other…
When was CVE-2026-57311 disclosed?
CVE-2026-57311 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57311 actively exploited?
CVE-2026-57311 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 51.1% of all scored CVEs.
What is the CVSS score of CVE-2026-57311?
CVE-2026-57311 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-57311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57311, 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-2026-57311

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