CVE-2026-3395

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A flaw has been found in MaxSite CMS up to 109.1. This impacts the function eval of the file application/maxsite/admin/plugins/editor_markitup/preview-ajax.php of the component MarkItUp Preview AJAX Endpoint. Executing a manipulation can lead to code injection. It is possible to launch the attack remotely. The exploit has been published and may be used. Upgrading to version 109.2 will fix this issue. This patch is called 08937a3c5d672a242d68f53e9fccf8a748820ef3. You should upgrade the affected component. The code maintainer was informed beforehand about the issues. He reacted very fast and highly professional.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

March 1, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 31, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 08937a3c5d67 (maxsite/cms)

Fix landed in maxsite/cms commit 08937a3c5d67 — awaiting tagged release

https://github.com/maxsite/cms/commit/08937a3c5d672a242d68f53e9fccf8a748820ef3
generic

GitHub - maxsite/cms: MaxSite CMS. Free CMS for your website. Smart alternative to WordPress · GitHub

https://github.com/maxsite/cms/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 62× 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 175 total refreshes for this CVE.

  1. 2026-09-01 13:53 UTCEPSS rescore
  2. 2026-09-01 04:39 UTCEPSS rescore
  3. 2026-09-01 01:34 UTCOSV refresh
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-19 17:03 UTCEPSS rescore
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-15 01:29 UTCGHSA enrichment
  20. 2026-08-14 21:06 UTCGHSA enrichment
  21. 2026-08-14 13:05 UTCGHSA enrichment
  22. 2026-08-14 08:47 UTCEG score recompute
  23. 2026-08-14 08:47 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 00:42 UTCEG score recompute
Show 75 more
  1. 2026-08-13 00:42 UTCGHSA enrichment
  2. 2026-08-12 13:51 UTCEPSS rescore
  3. 2026-08-11 23:30 UTCEG score recompute
  4. 2026-08-11 23:30 UTCGHSA enrichment
  5. 2026-08-11 13:43 UTCEPSS rescore
  6. 2026-08-11 06:03 UTCEG score recompute
  7. 2026-08-11 06:03 UTCGHSA enrichment
  8. 2026-08-11 00:00 UTCEPSS rescore
  9. 2026-08-10 13:10 UTCGHSA enrichment
  10. 2026-08-10 08:22 UTCGHSA enrichment
  11. 2026-08-10 02:51 UTCGHSA enrichment
  12. 2026-08-09 22:22 UTCGHSA enrichment
  13. 2026-08-09 18:05 UTCEG score recompute
  14. 2026-08-09 18:05 UTCGHSA enrichment
  15. 2026-08-09 13:46 UTCEPSS rescore
  16. 2026-08-09 13:45 UTCGHSA enrichment
  17. 2026-08-09 08:25 UTCEG score recompute
  18. 2026-08-09 08:25 UTCGHSA enrichment
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-08 09:16 UTCGHSA enrichment
  21. 2026-08-08 04:58 UTCGHSA enrichment
  22. 2026-08-08 00:41 UTCGHSA enrichment
  23. 2026-08-07 20:23 UTCEG score recompute
  24. 2026-08-07 20:23 UTCGHSA enrichment
  25. 2026-08-06 13:46 UTCEPSS rescore
  26. 2026-08-06 07:10 UTCGHSA enrichment
  27. 2026-08-06 02:52 UTCEG score recompute
  28. 2026-08-06 02:52 UTCGHSA enrichment
  29. 2026-08-05 19:17 UTCEPSS rescore
  30. 2026-08-04 15:10 UTCEPSS rescore
  31. 2026-08-04 10:38 UTCEPSS rescore
  32. 2026-08-04 04:42 UTCEG score recompute
  33. 2026-08-04 04:42 UTCGHSA enrichment
  34. 2026-08-03 10:36 UTCEPSS rescore
  35. 2026-08-02 23:34 UTCGHSA enrichment
  36. 2026-08-02 19:16 UTCEG score recompute▲ 2.50
  37. 2026-08-02 19:16 UTCGHSA enrichment
  38. 2026-08-02 02:27 UTCEPSS rescore
  39. 2026-08-01 04:16 UTCEPSS rescore
  40. 2026-07-30 16:28 UTCEPSS rescore
  41. 2026-07-30 01:30 UTCEPSS rescore
  42. 2026-07-27 14:13 UTCEPSS rescore
  43. 2026-07-26 14:54 UTCEPSS rescore
  44. 2026-07-26 14:54 UTCEPSS rescore
  45. 2026-07-25 14:18 UTCEPSS rescore
  46. 2026-07-25 14:18 UTCEPSS rescore
  47. 2026-07-24 14:17 UTCEPSS rescore
  48. 2026-07-24 14:17 UTCEPSS rescore
  49. 2026-07-23 14:18 UTCEPSS rescore
  50. 2026-07-23 14:18 UTCEPSS rescore
  51. 2026-07-23 03:09 UTCEG score recompute
  52. 2026-07-22 14:08 UTCEPSS rescore
  53. 2026-07-21 15:24 UTCEPSS rescore
  54. 2026-07-20 17:08 UTCEPSS rescore
  55. 2026-07-19 14:31 UTCEPSS rescore
  56. 2026-07-19 02:29 UTCEPSS rescore
  57. 2026-07-18 10:04 UTCEPSS rescore
  58. 2026-07-17 10:59 UTCOSV refresh
  59. 2026-07-16 17:03 UTCEPSS rescore
  60. 2026-07-15 16:57 UTCEPSS rescore
  61. 2026-07-15 16:57 UTCEPSS rescore
  62. 2026-07-15 02:00 UTCEPSS rescore
  63. 2026-07-13 22:30 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-13 06:13 UTCEPSS rescore
  66. 2026-07-12 05:46 UTCEPSS rescore
  67. 2026-07-11 08:27 UTCEPSS rescore
  68. 2026-07-09 19:10 UTCEPSS rescore
  69. 2026-07-08 15:15 UTCEPSS rescore
  70. 2026-07-07 13:46 UTCEPSS rescore
  71. 2026-07-06 16:27 UTCEPSS rescore
  72. 2026-07-06 16:27 UTCEPSS rescore
  73. 2026-07-06 02:23 UTCEPSS rescore
  74. 2026-07-06 02:23 UTCEPSS rescore
  75. 2026-07-05 02:30 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmbanyamer/CVE-2026-3395-MaxSite-CMS-Unauthenticated-RCE
    First seen Mar 1, 2026
    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-3395.yaml
    First seen Jan 1, 2026

    MaxSite CMS <=109.1 - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-3395?
CVE-2026-3395 is a critical vulnerability published on March 1, 2026. A flaw has been found in MaxSite CMS up to 109.1. This impacts the function eval of the file application/maxsite/admin/plugins/editor_markitup/preview-ajax.php of the component MarkItUp Preview AJAX Endpoint. Executing a manipulation can lead to code injection. It is possible to launch the attack…
When was CVE-2026-3395 disclosed?
CVE-2026-3395 was first published in the National Vulnerability Database on March 1, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3395 actively exploited?
CVE-2026-3395 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.5% of all scored CVEs.
What is the CVSS score of CVE-2026-3395?
CVE-2026-3395 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-3395?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3395, 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-2026-3395

Explore →

Is Your Infrastructure Affected by CVE-2026-3395?

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

Start Free Scan →Browse All CVEs