CVE-2026-70552

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-04. 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.

MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php file in the codebase. Attackers can exploit this dispatcher bypass to reach privileged plugin endpoints without credentials, enabling actions such as manipulating poll states and vote counts, and amplifying the impact of any dangerous operation performed by admin-only ajax files across the plugin tree.

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

August 4, 2026

Last Modified

August 31, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-ajax-dispatcher-bypass-via-ajax-php
generic

MaxSite CMS 109.6. Обновление безопасности

https://max-3000.com/page/maxsite-cms-109-6
generic

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

https://github.com/maxsite/cms

Vendor Advisories for CVE-2026-70552(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 38× in last 7d / 179× 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 333 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70552?
CVE-2026-70552 is a critical vulnerability published on August 4, 2026. MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php file in the codebase.…
When was CVE-2026-70552 disclosed?
CVE-2026-70552 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70552 actively exploited?
CVE-2026-70552 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 54.3% of all scored CVEs.
What is the CVSS score of CVE-2026-70552?
CVE-2026-70552 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-70552?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70552, 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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