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VulnerabilityPublished Updated

CVE-2026-45315: open-webui · Cross-site Scripting

Affects open-webuiSource GCVE Database

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Not known to be exploited · CVSS 8.7 High : upgrade to 0.9.3 soon.

Data as of 12 Nov 2026, 00:04 UTC

CVSS 3.1 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.18.7
EPSS
0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.9.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade open-webui to 0.9.3.

Affected software

ProductAffectedFixed in
open-webui open-webuiAffected
  • <0.9.3
Fixed in
  • 0.9.3

AI-suggested

Upgrade open-webui to version 0.9.3 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory. Users should ensure that only trusted users have the chat.stt permission to reduce risk prior to patching.

Description

CVE-2026-45315 is a high-severity cross-site scripting (XSS) vulnerability in open-webui versions prior to 0.9.3. The issue arises from the audio transcription upload endpoint, which saves files using the user-supplied filename extension without proper validation. This allows a verified user with chat.stt permission to upload a malicious polyglot WAV+HTML file that executes arbitrary scripts in the context of the Open WebUI origin when accessed by other users. The vulnerability is fixed in version 0.9.3.

References

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