CVE-2026-24399

CRITICALNVD 5.49.3▲
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

ChatterMate is a no-code AI chatbot agent framework. In versions 1.0.8 and below, the chatbot accepts and executes malicious HTML/JavaScript payloads when supplied as chat input. Specifically, an payload containing a javascript: URI can be processed and executed in the browser context. This allows access to sensitive client-side data such as localStorage tokens and cookies, resulting in client-side injection. This issue has been fixed in version 1.0.9.

CVSS v3
5.4
EG Score
9.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

January 24, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Jun 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Stored Cross-Site Scripting (XSS) via Chatbot Input Execution · Advisory · chattermate/chattermate.chat · GitHub

https://github.com/chattermate/chattermate.chat/security/advisories/GHSA-72p3-w95w-q3j4
github_release Patch Available

v1.0.9

Patch available: chattermate/chattermate.chat v1.0.9

https://github.com/chattermate/chattermate.chat/releases/tag/v1.0.9
github_commit Patch Available

commit ff3398031abb (chattermate/chattermate.chat)

Patch available: chattermate/chattermate.chat v1.0.9 (contains commit ff3398031abb)

https://github.com/chattermate/chattermate.chat/commit/ff3398031abb97ae28546eaf993fed3619eaffdd

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 46× 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 109 total refreshes for this CVE.

  1. 2026-08-01 04:16 UTCEPSS rescore
  2. 2026-07-31 12:42 UTCOSV refresh
  3. 2026-07-30 01:30 UTCEPSS rescore
  4. 2026-07-27 14:13 UTCEPSS rescore
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  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:07 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-21 15:24 UTCEPSS rescore
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  16. 2026-07-20 17:08 UTCEPSS rescore
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  1. 2026-07-15 16:57 UTCEPSS rescore
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  4. 2026-07-13 22:30 UTCEPSS rescore
  5. 2026-07-13 20:08 UTCOSV refresh
  6. 2026-07-13 06:13 UTCEPSS rescore
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  8. 2026-07-12 05:46 UTCEPSS rescore
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  10. 2026-07-11 08:27 UTCEPSS rescore
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  22. 2026-07-01 15:06 UTCEPSS rescore
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  24. 2026-06-30 23:22 UTCEPSS rescore
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  26. 2026-06-29 14:06 UTCEPSS rescore
  27. 2026-06-28 14:07 UTCEPSS rescore
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  29. 2026-06-28 04:56 UTCEPSS rescore
  30. 2026-06-28 04:56 UTCEPSS rescore
  31. 2026-06-27 03:08 UTCEPSS rescore
  32. 2026-06-25 17:46 UTCOSV refresh
  33. 2026-06-25 13:49 UTCEPSS rescore
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  35. 2026-06-24 14:05 UTCEPSS rescore
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  37. 2026-06-23 21:33 UTCEPSS rescore
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  39. 2026-06-22 14:25 UTCEPSS rescore
  40. 2026-06-22 14:25 UTCEPSS rescore
  41. 2026-06-21 14:56 UTCEPSS rescore
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  43. 2026-06-21 01:59 UTCEPSS rescore
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  45. 2026-06-19 19:25 UTCEPSS rescore
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  47. 2026-06-18 17:52 UTCEPSS rescore
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  50. 2026-06-16 17:52 UTCEPSS rescore
  51. 2026-06-15 17:48 UTCEPSS rescore
  52. 2026-06-14 23:18 UTCEPSS rescore
  53. 2026-06-13 23:00 UTCEPSS rescore
  54. 2026-06-12 23:12 UTCEPSS rescore
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  57. 2026-06-10 22:18 UTCEPSS rescore
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  59. 2026-06-10 13:22 UTCEPSS rescore
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  62. 2026-06-07 15:25 UTCEPSS rescore
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  65. 2026-06-06 13:47 UTCEPSS rescore
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  67. 2026-06-05 22:47 UTCEPSS rescore
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  72. 2026-06-02 20:13 UTCEPSS rescore
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  74. 2026-06-01 13:51 UTCEPSS rescore
  75. 2026-06-01 13:51 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-24399?
CVE-2026-24399 is a critical vulnerability published on January 24, 2026. ChatterMate is a no-code AI chatbot agent framework. In versions 1.0.8 and below, the chatbot accepts and executes malicious HTML/JavaScript payloads when supplied as chat input. Specifically, an <iframe> payload containing a javascript: URI can be processed and executed in the browser context.…
When was CVE-2026-24399 disclosed?
CVE-2026-24399 was first published in the National Vulnerability Database on January 24, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24399 actively exploited?
CVE-2026-24399 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 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-24399?
CVE-2026-24399 has a CVSS v3 base score of 5.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.3.
How do I remediate CVE-2026-24399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24399, 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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