CVE-2026-45315

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% 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
Elevated
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0

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

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no Content-Disposition. A verified user with the default-on chat.stt permission can upload a polyglot WAV+HTML file named pwn.html and trick any other user into opening the resulting URL — the response comes back as text/html and any embedded runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
7.6%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 19, 2026

Advisory Details (1)

Auto-updated May 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xr

Vendor Advisories for CVE-2026-45315(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
open-webui0.1.124 ... 0.9.2 (154 versions)0.9.3—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 49× 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 104 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
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  15. 2026-06-28 10:57 UTCEG score recompute
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  7. 2026-06-19 19:25 UTCEPSS rescore
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  10. 2026-06-18 02:54 UTCEG score recompute
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  22. 2026-06-12 23:12 UTCEPSS rescore
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  24. 2026-06-12 17:53 UTCEG score recompute
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  26. 2026-06-11 16:49 UTCEG score recompute
  27. 2026-06-11 14:00 UTCEPSS rescore
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  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 15:16 UTCEG score recompute
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  33. 2026-06-10 02:44 UTCEG score recompute
  34. 2026-06-09 14:11 UTCEG score recompute
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  36. 2026-06-08 14:17 UTCEPSS rescore
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  39. 2026-06-08 00:31 UTCEG score recompute
  40. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-06-07 11:59 UTCEG score recompute
  43. 2026-06-06 23:27 UTCEG score recompute
  44. 2026-06-06 13:47 UTCEPSS rescore
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  47. 2026-06-05 22:47 UTCEPSS rescore
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  50. 2026-06-05 06:10 UTCEPSS rescore
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  53. 2026-06-04 13:12 UTCEPSS rescore
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  55. 2026-06-04 08:44 UTCEG score recompute
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  62. 2026-06-01 13:52 UTCEPSS rescore
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  65. 2026-05-31 22:30 UTCEPSS rescore
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  69. 2026-05-29 13:44 UTCEPSS rescore
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  71. 2026-05-27 13:40 UTCEPSS rescore
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  73. 2026-05-26 13:44 UTCEPSS rescore
  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-23 00:07 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45315?
CVE-2026-45315 is a high vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route…
When was CVE-2026-45315 disclosed?
CVE-2026-45315 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45315 actively exploited?
CVE-2026-45315 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45315?
CVE-2026-45315 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-45315?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45315, 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.

Dependency Blast Radius

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