CVE-2026-82290

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory published 2026-08-28. The CNA's CVSS baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-67821 (ENISA EUVD) · GHSA-4hhp-mjp7-37r2 (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: No code on recordExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists chainlit versions up to and including 2.12.0 as affected. No release containing a fix is confirmed on record.

Chainlit through 2.12.0 fails to validate ownership of feedback records in PUT and DELETE endpoints. Authenticated attackers can delete or modify other users' feedback by supplying arbitrary feedback identifiers, corrupting human-rating data used for model evaluation.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.3%
EPSS %ILE
27th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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 public PoC (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

August 28, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
No fix on record yet.
Web page

Chainlit Feedback Endpoints Missing Ownership Validation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/chainlit-feedback-endpoints-missing-ownership-validation
Web page

chainlit/backend/chainlit/server.py at 190ea74239d9e84b26e7c91bc2882dd038942564 · Chainlit/chainlit · GitHub

https://github.com/Chainlit/chainlit/blob/190ea74239d9e84b26e7c91bc2882dd038942564/backend/chainlit/server.py
Web page

GitHub - Chainlit/chainlit: Build Conversational AI in minutes ⚡️ · GitHub

https://github.com/Chainlit/chainlit
Web page

Feedback IDOR -- any authenticated user can delete or modify other users' feedback · Issue #2975 · Chainlit/chainlit · GitHub

https://github.com/Chainlit/chainlit/issues/2975

Vendor Advisories for CVE-2026-82290(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 10× in last 7d / 65× 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 153 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 53 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  2. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-10-25 13:58 UTCEG score recompute
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  7. 2026-10-22 13:45 UTCEG score recompute
  8. 2026-10-22 13:45 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  9. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  13. 2026-10-18 03:08 UTCEG score recompute
  14. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  15. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-10-12 14:55 UTCEG score recompute
  21. 2026-10-11 19:20 UTCEG score recompute
  22. 2026-10-11 16:36 UTCEG score recompute
  23. 2026-10-11 13:54 UTCEG score recompute
  24. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 75 more
  1. 2026-10-10 05:49 UTCEG score recompute
  2. 2026-10-10 05:49 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-10-09 07:10 UTCEG score recompute
  5. 2026-10-09 07:09 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  6. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-08 08:29 UTCEG score recompute
  8. 2026-10-08 08:29 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-10-07 09:50 UTCEG score recompute
  11. 2026-10-07 09:50 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  13. 2026-10-06 11:10 UTCEG score recompute
  14. 2026-10-06 11:10 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-10-05 11:19 UTCEG score recompute
  17. 2026-10-05 11:19 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-04 12:18 UTCEG score recompute
  20. 2026-10-04 12:18 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-10-03 13:39 UTCEG score recompute
  23. 2026-10-03 13:39 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  24. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-02 09:07 UTCEG score recompute
  26. 2026-10-02 09:07 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  28. 2026-10-01 10:11 UTCEG score recompute
  29. 2026-10-01 10:11 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  30. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  31. 2026-09-30 11:32 UTCEG score recompute
  32. 2026-09-30 11:32 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  33. 2026-09-29 11:54 UTCEG score recompute
  34. 2026-09-29 11:54 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  35. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  36. 2026-09-28 13:02 UTCEG score recompute
  37. 2026-09-28 13:02 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  38. 2026-09-27 14:23 UTCEG score recompute
  39. 2026-09-27 14:23 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  40. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  41. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  42. 2026-09-26 15:36 UTCEG score recompute
  43. 2026-09-26 15:36 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  44. 2026-09-25 13:43 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  45. 2026-09-24 14:56 UTCEG score recompute
  46. 2026-09-24 14:56 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  47. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  48. 2026-09-24 03:30 UTCEG score recompute
  49. 2026-09-24 03:30 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  50. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-09-23 04:51 UTCEG score recompute
  52. 2026-09-23 04:51 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  53. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  54. 2026-09-22 06:11 UTCEG score recompute
  55. 2026-09-22 06:11 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  56. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  57. 2026-09-21 07:32 UTCEG score recompute
  58. 2026-09-21 07:32 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  59. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  60. 2026-09-20 08:40 UTCEG score recompute
  61. 2026-09-20 08:40 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  62. 2026-09-19 10:01 UTCEG score recompute
  63. 2026-09-19 10:01 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  64. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  65. 2026-09-18 11:08 UTCEG score recompute
  66. 2026-09-18 11:08 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  67. 2026-09-17 12:29 UTCEG score recompute
  68. 2026-09-17 12:28 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  69. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  70. 2026-09-16 13:46 UTCEG score recompute
  71. 2026-09-16 13:46 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  72. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  73. 2026-09-15 23:39 UTCEG score recompute
  74. 2026-09-15 23:39 UTCGHSA enrichmentGHSA-4hhp-mjp7-37r2 · GitHub CVSS 5.3
  75. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 11th percentile

Frequently asked(5)

What is CVE-2026-82290?
CVE-2026-82290 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. Chainlit through 2.12.0 fails to validate ownership of feedback records in PUT and DELETE endpoints. Authenticated attackers can delete or modify other users' feedback by supplying arbitrary feedback identifiers, corrupting human-rating data used for model evaluation.
When was CVE-2026-82290 made public?
CVE-2026-82290 was made public on July 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 28, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-82290 actively exploited?
CVE-2026-82290 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-82290?
CVE-2026-82290 has a CVSS base score of 5.3 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-82290?
No fix for CVE-2026-82290 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 CVE record's CNA (VulnCheck) lists chainlit versions up to and including 2.12.0 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-82290 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82290

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