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: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
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
17%
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 26× in last 7d / 90× 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 131 total refreshes for this CVE.

  1. 2026-08-03 10:36 UTCEPSS rescore
  2. 2026-08-03 07:59 UTCGHSA enrichment
  3. 2026-08-02 18:54 UTCGHSA enrichment
  4. 2026-08-02 07:12 UTCEG score recompute
  5. 2026-08-02 07:12 UTCGHSA enrichment
  6. 2026-08-02 02:27 UTCEPSS rescore
  7. 2026-08-01 19:29 UTCGHSA enrichment
  8. 2026-08-01 07:47 UTCEG score recompute
  9. 2026-08-01 07:47 UTCGHSA enrichment
  10. 2026-08-01 04:16 UTCEPSS rescore
  11. 2026-07-31 18:54 UTCGHSA enrichment
  12. 2026-07-31 07:06 UTCGHSA enrichment
  13. 2026-07-30 19:24 UTCEG score recompute
  14. 2026-07-30 19:24 UTCGHSA enrichment
  15. 2026-07-30 16:28 UTCEPSS rescore
  16. 2026-07-30 02:44 UTCEG score recompute
  17. 2026-07-30 02:44 UTCGHSA enrichment
  18. 2026-07-30 01:30 UTCEPSS rescore
  19. 2026-07-30 01:30 UTCEPSS rescore
  20. 2026-07-29 13:07 UTCGHSA enrichment
  21. 2026-07-29 01:23 UTCEG score recompute
  22. 2026-07-29 01:23 UTCGHSA enrichment
  23. 2026-07-28 15:37 UTCEPSS rescore
  24. 2026-07-28 05:55 UTCGHSA enrichment
  25. 2026-07-27 17:58 UTCEG score recompute
Show 75 more
  1. 2026-07-27 17:58 UTCGHSA enrichment
  2. 2026-07-27 03:54 UTCGHSA enrichment
  3. 2026-07-26 16:01 UTCEG score recompute
  4. 2026-07-26 16:01 UTCGHSA enrichment
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:20 UTCEG score recompute▲ 0.80
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:25 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 14:31 UTCEPSS rescore
  15. 2026-07-19 02:29 UTCEPSS rescore
  16. 2026-07-18 10:04 UTCEPSS rescore
  17. 2026-07-17 06:40 UTCGHSA enrichment
  18. 2026-07-16 18:57 UTCGHSA enrichment
  19. 2026-07-16 17:03 UTCEPSS rescore
  20. 2026-07-16 07:13 UTCGHSA enrichment
  21. 2026-07-15 19:12 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-15 07:26 UTCGHSA enrichment
  25. 2026-07-15 02:00 UTCEPSS rescore
  26. 2026-07-15 02:00 UTCEPSS rescore
  27. 2026-07-14 19:40 UTCGHSA enrichment
  28. 2026-07-14 07:33 UTCGHSA enrichment
  29. 2026-07-13 22:31 UTCEPSS rescore
  30. 2026-07-13 19:49 UTCGHSA enrichment
  31. 2026-07-13 08:07 UTCGHSA enrichment
  32. 2026-07-13 06:13 UTCEPSS rescore
  33. 2026-07-13 06:13 UTCEPSS rescore
  34. 2026-07-12 20:25 UTCGHSA enrichment
  35. 2026-07-12 08:43 UTCGHSA enrichment
  36. 2026-07-12 05:46 UTCEPSS rescore
  37. 2026-07-11 20:59 UTCGHSA enrichment
  38. 2026-07-11 09:16 UTCGHSA enrichment
  39. 2026-07-11 08:27 UTCEPSS rescore
  40. 2026-07-11 08:27 UTCEPSS rescore
  41. 2026-07-10 21:34 UTCGHSA enrichment
  42. 2026-07-10 09:50 UTCGHSA enrichment
  43. 2026-07-09 21:40 UTCGHSA enrichment
  44. 2026-07-09 19:10 UTCEPSS rescore
  45. 2026-07-09 19:10 UTCEPSS rescore
  46. 2026-07-09 09:57 UTCGHSA enrichment
  47. 2026-07-08 22:14 UTCGHSA enrichment
  48. 2026-07-08 15:16 UTCEPSS rescore
  49. 2026-07-08 15:16 UTCEPSS rescore
  50. 2026-07-08 10:32 UTCGHSA enrichment
  51. 2026-07-07 22:49 UTCGHSA enrichment
  52. 2026-07-07 13:46 UTCEPSS rescore
  53. 2026-07-07 13:46 UTCEPSS rescore
  54. 2026-07-07 11:06 UTCGHSA enrichment
  55. 2026-07-06 23:09 UTCGHSA enrichment
  56. 2026-07-06 16:27 UTCEPSS rescore
  57. 2026-07-06 16:27 UTCEPSS rescore
  58. 2026-07-06 11:26 UTCGHSA enrichment
  59. 2026-07-06 02:23 UTCEPSS rescore
  60. 2026-07-06 02:23 UTCEPSS rescore
  61. 2026-07-05 23:39 UTCGHSA enrichment
  62. 2026-07-05 11:56 UTCGHSA enrichment
  63. 2026-07-05 02:31 UTCEPSS rescore
  64. 2026-07-05 02:30 UTCEPSS rescore
  65. 2026-07-05 00:13 UTCGHSA enrichment
  66. 2026-07-04 12:29 UTCGHSA enrichment
  67. 2026-07-04 06:31 UTCEPSS rescore
  68. 2026-07-04 06:31 UTCEPSS rescore
  69. 2026-07-04 00:47 UTCGHSA enrichment
  70. 2026-07-03 12:55 UTCGHSA enrichment
  71. 2026-07-03 00:03 UTCGHSA enrichment
  72. 2026-07-02 12:19 UTCGHSA enrichment
  73. 2026-07-02 00:37 UTCGHSA enrichment
  74. 2026-07-01 15:07 UTCEPSS rescore
  75. 2026-07-01 12:54 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 82.7% 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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