CVE-2026-63239

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.4 from GitHub Security Advisory published 2026-07-29. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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

A hard-coded AWS IAM credentials vulnerability in Koollab LMS allowed an attacker to access shared multi-tenant S3 buckets and SQS queues, exposing sensitive data and enabling malicious content injection, job manipulation, or email interception.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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 (value × EchelonGraph’s weight)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
10th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Jul 29, 2026
No fix on record yet.
Web page

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-2026-63239(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 11× in last 7d / 53× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 176 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 76 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  3. 2026-10-12 15:49 UTCEG score recompute
  4. 2026-10-11 19:33 UTCEG score recompute
  5. 2026-10-11 16:48 UTCEG score recompute
  6. 2026-10-11 14:10 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  12. 2026-10-07 00:03 UTCEG score recompute
  13. 2026-10-07 00:03 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-10-04 07:06 UTCEG score recompute
  18. 2026-10-04 07:06 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-10-02 17:59 UTCEG score recompute
  21. 2026-10-02 17:59 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-10-01 03:38 UTCEG score recompute
  25. 2026-10-01 03:38 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
Show 75 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  2. 2026-09-29 07:38 UTCEG score recompute
  3. 2026-09-29 07:38 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  4. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-09-28 03:20 UTCEG score recompute
  6. 2026-09-28 03:20 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-09-25 05:53 UTCEG score recompute
  9. 2026-09-25 05:53 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  10. 2026-09-23 21:52 UTCEG score recompute
  11. 2026-09-23 21:52 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  12. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-22 15:54 UTCEG score recompute
  14. 2026-09-22 15:54 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-20 11:17 UTCEG score recompute
  17. 2026-09-20 11:17 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  18. 2026-09-19 08:05 UTCEG score recompute
  19. 2026-09-19 08:05 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-18 06:37 UTCEG score recompute
  22. 2026-09-18 06:37 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  23. 2026-09-17 06:16 UTCEG score recompute
  24. 2026-09-17 06:16 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-09-16 05:50 UTCEG score recompute
  27. 2026-09-16 05:50 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  29. 2026-09-14 10:14 UTCEG score recompute
  30. 2026-09-14 10:14 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  31. 2026-09-13 09:22 UTCEG score recompute
  32. 2026-09-13 09:22 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  33. 2026-09-12 08:59 UTCEG score recompute
  34. 2026-09-12 08:59 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  35. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  36. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  37. 2026-09-11 08:36 UTCEG score recompute
  38. 2026-09-11 08:36 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  39. 2026-09-10 08:15 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  40. 2026-09-09 07:54 UTCEG score recompute
  41. 2026-09-09 07:54 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  42. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  43. 2026-09-07 23:04 UTCEG score recompute
  44. 2026-09-07 23:04 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  45. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-09-06 22:43 UTCEG score recompute
  47. 2026-09-06 22:43 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  48. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  49. 2026-09-05 19:08 UTCEG score recompute
  50. 2026-09-05 19:08 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  51. 2026-09-04 11:58 UTCEG score recompute
  52. 2026-09-04 11:58 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  53. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  54. 2026-09-02 01:01 UTCEG score recompute
  55. 2026-09-02 01:01 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  56. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  58. 2026-09-01 00:40 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  59. 2026-08-30 23:45 UTCEG score recompute
  60. 2026-08-30 23:45 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  61. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  62. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  63. 2026-08-29 23:24 UTCEG score recompute
  64. 2026-08-29 23:24 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  65. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  66. 2026-08-28 02:59 UTCEG score recompute
  67. 2026-08-28 02:59 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  68. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  69. 2026-08-27 02:38 UTCEG score recompute
  70. 2026-08-27 02:38 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  71. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  72. 2026-08-26 02:17 UTCEG score recompute
  73. 2026-08-26 02:17 UTCGHSA enrichmentGHSA-4fpv-9r28-747f · GitHub CVSS 5.4
  74. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  75. 2026-08-25 01:56 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63239?
CVE-2026-63239 is a medium-severity vulnerability; its CVE record was published on July 29, 2026. A hard-coded AWS IAM credentials vulnerability in Koollab LMS allowed an attacker to access shared multi-tenant S3 buckets and SQS queues, exposing sensitive data and enabling malicious content injection, job manipulation, or email interception.
When was CVE-2026-63239 made public?
CVE-2026-63239 was made public on July 29, 2026: that is the date its CVE record's CNA, Cyber Security Agency of Singapore, gives for when the vulnerability was made public. The CVE record itself was published on July 29, 2026. EchelonGraph's copy of the record carries a last-modified date of July 30, 2026; the record at its source may have been updated since.
Is CVE-2026-63239 actively exploited?
CVE-2026-63239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63239?
CVE-2026-63239 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63239?
No fix for CVE-2026-63239 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-63239 are linked in the Vendor Advisories panel on this page.

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