CVE-2026-48763

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.5%CVSS: 8.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

TypeBot is a chatbot builder tool. Versions prior to 3.17.0 expose a deprecated public upload endpoint at GET /api/v1/typebots/{typebotId}/blocks/{blockId}/storage/upload-url that accepts an attacker-controlled filePath and returns a presigned S3 PUT URL for that exact key. Because the endpoint only checks that the referenced typebot is public and that the referenced block is a file input block, an unauthenticated attacker who knows a valid public typebotId and blockId can request presigned upload URLs for arbitrary objects in the shared bucket, including private/... and other tenants' public/... paths. Version 3.17.0 fixes this issue.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100

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 (value × EchelonGraph’s weight)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 11, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 11, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
GitHub advisoryMentions a patch (unverified)

Arbitrary S3 Object Write in deprecated public upload endpoint via attacker-controlled filePath · Advisory · baptisteArno/typebot.io · GitHub

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-m7f5-3wcm-x2c4
GitHub release Patch Available

v3.17.0

Patch available: baptisteArno/typebot.io v3.17.0

https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0
GitHub pull request Patch Available

🐛 Fix credential access control and remove vulnerable S3 upload endpoint

Patch available: baptisteArno/typebot.io v3.17.0 (PR #2459 merged 2026-04-15)

https://github.com/baptisteArno/typebot.io/pull/2459
GitHub commit Patch Available

commit 7ae4c007d098 (baptisteArno/typebot.io)

Patch available: baptisteArno/typebot.io v3.17.0 (contains commit 7ae4c007d098)

https://github.com/baptisteArno/typebot.io/commit/7ae4c007d0987d2ca907b47e1b7418db62b8a157

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 46× 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 111 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 11 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-12 16:00 UTCEG score recompute
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  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  1. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-09-28 02:03 UTCEG score recompute
  3. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  7. 2026-09-25 03:45 UTCEG score recompute
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  9. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-09-22 23:50 UTCEG score recompute
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  13. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  14. 2026-09-19 16:53 UTCEG score recompute
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  16. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-09-18 02:12 UTCEG score recompute
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  19. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  21. 2026-09-15 15:48 UTCEG score recompute
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  23. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-13 00:50 UTCEG score recompute
  25. 2026-09-11 23:57 UTCEG score recompute
  26. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  27. 2026-09-11 10:14 UTCEG score recompute
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  29. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
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  51. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-27 16:34 UTCEG score recompute
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  58. 2026-08-25 01:43 UTCEG score recompute
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  61. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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Frequently asked(5)

What is CVE-2026-48763?
CVE-2026-48763 is a high-severity vulnerability; its CVE record was published on August 11, 2026. TypeBot is a chatbot builder tool. Versions prior to 3.17.0 expose a deprecated public upload endpoint at GET /api/v1/typebots/{typebotId}/blocks/{blockId}/storage/upload-url that accepts an attacker-controlled filePath and returns a presigned S3 PUT URL for that exact key. Because the endpoint…
When was the CVE record for CVE-2026-48763 published?
The CVE record for CVE-2026-48763 was published on August 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-48763 actively exploited?
CVE-2026-48763 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48763?
CVE-2026-48763 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48763?
A fix for CVE-2026-48763 is available: update to the fixed version the vendor names in its advisory.

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