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
30%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Sep 16, 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 32× in last 7d / 149× 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 352 total refreshes for this CVE.

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

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 70.4% 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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