CVE-2026-56104

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, secondary
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the restore_existing_session path to assume a victim's permissions and roles, enabling unauthorized invocation of tools and access to data restricted to the authenticated victim.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Jun 22, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/chainlit-session-hijacking-via-websocket-session-restoration
github_release Patch Available

2.10.1

Patch available: Chainlit/chainlit 2.10.1

https://github.com/Chainlit/chainlit/releases/tag/2.10.1
github_pr Patch Available

fix: validate session ownership on websocket restore

Patch available: Chainlit/chainlit 2.10.1 (PR #2857 merged 2026-03-24)

https://github.com/Chainlit/chainlit/pull/2857
github_commit Patch Available

commit 5effb664f1e0 (Chainlit/chainlit)

Patch available: Chainlit/chainlit 2.10.1 (contains commit 5effb664f1e0)

https://github.com/Chainlit/chainlit/commit/5effb664f1e0af4a4f0a42fe63ea979676039a7f

Vendor Advisories for CVE-2026-56104(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 5× in last 7d / 58× 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 224 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56104?
CVE-2026-56104 is a high vulnerability published on June 22, 2026. Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the…
When was CVE-2026-56104 disclosed?
CVE-2026-56104 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56104 actively exploited?
CVE-2026-56104 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-56104?
CVE-2026-56104 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-56104?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56104, 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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