CVE-2026-63233

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-29. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: None knownExposed: 0

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

A SQL injection and unsafe deserialisation vulnerability in Koollab LMS allowed an authenticated attacker to inject through the assessment overall answer endpoint, control data passed to unserialize(), write a webshell to a publicly accessible location, and execute arbitrary code on the server.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

Koollab LMS - Multiple Vulnerabilities including Remote Code Execution, SQL Injection, and Authentication Bypass | Cyber Security Agency of Singapore

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/

Vendor Advisories for CVE-2026-63233(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 42× in last 7d / 230× 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 256 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63233?
CVE-2026-63233 is a critical vulnerability published on July 29, 2026. A SQL injection and unsafe deserialisation vulnerability in Koollab LMS allowed an authenticated attacker to inject through the assessment overall answer endpoint, control data passed to unserialize(), write a webshell to a publicly accessible location, and execute arbitrary code on the server.
When was CVE-2026-63233 disclosed?
CVE-2026-63233 was first published in the National Vulnerability Database on July 29, 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-2026-63233 actively exploited?
CVE-2026-63233 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 78.5% of all scored CVEs.
What is the CVSS score of CVE-2026-63233?
CVE-2026-63233 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-63233?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63233, 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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