CVE-2026-15617

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision and unauthorized account access via case- or Unicode-different identities.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 27, 2026

Advisory Details (1)

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

logto/packages/core/src/libraries/verification-helpers/single-sign-on-guard.ts at ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8 · logto-io/logto · GitHub

https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/libraries/verification-helpers/single-sign-on-guard.ts#L23-L33

Vendor Advisories for CVE-2026-15617(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 57× in last 7d / 243× 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 250 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-15617?
CVE-2026-15617 is a critical vulnerability published on July 23, 2026. Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision and unauthorized account access via case- or Unicode-different identities.
When was CVE-2026-15617 disclosed?
CVE-2026-15617 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15617 actively exploited?
CVE-2026-15617 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 71.5% of all scored CVEs.
What is the CVSS score of CVE-2026-15617?
CVE-2026-15617 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-15617?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15617, 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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