CVE-2026-70553

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-04. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
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 contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious db_dbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.

CVSS v3
9.8
EG Score
9.8(high)
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
56%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 14, 2026

Advisory Details (3)

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

MaxSite CMS Unauthenticated RCE via Install Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-rce-via-install-endpoint
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-2026-70553(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 60× in last 7d / 141× 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 141 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-70553?
CVE-2026-70553 is a critical vulnerability published on August 4, 2026. MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious…
When was CVE-2026-70553 disclosed?
CVE-2026-70553 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70553 actively exploited?
CVE-2026-70553 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 43.7% of all scored CVEs.
What is the CVSS score of CVE-2026-70553?
CVE-2026-70553 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-70553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70553, 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.

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