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  4. CVE 2026 109300 open webui 0631 before 0114 stored xss via tool
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Back to active CVEs
Medium · CVSS 5.1CVE-2026-109300

Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call EmbedsCVE-2026-109300

Answer in brief

CVE-2026-109300 records a Medium severity (CVSS 5.1) vulnerability in Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds. The current sources do not mark it as known exploited. The current feed maps open-webui/open-webui (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps open-webui/open-webui (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
open-webui/open-webuigeneric>=0.6.31 <0.11.40.11.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for open-webui/open-webui.
  2. 2Review the reported fix. Update open-webui/open-webui to 0.11.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 12, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Open WebUI from 0.6.31 before 0.11.4 contains a stored cross-site scripting vulnerability in its Markdown renderer, which treats user-authored tool-call details blocks as tool output and mounts their embeds attribute in script-enabled iframes. Authenticated users can post crafted channel messages, chat messages, or citation content that runs JavaScript in viewers' browsers, enabling in-app phishing, or session hijacking where iframeSandboxAllowSameOrigin is enabled.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • WordPress Quiz And Survey Master plugin <= 11.2.7 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress Element Pack Elementor Addons plugin <= 8.8.8 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress Premium Addons for Elementor plugin <= 4.11.110 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • Netcore NR268 Web UI l7_call_board_user_set.cgi eval cross site scriptingAlso CWE-79
  • Cross-site scripting in Progress MarkLogic ServerAlso CWE-79
  • WordPress Salevo plugin <= 1.3.0 - Broken Access Control vulnerabilitySame generic ecosystem

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 12, 2026
References
2 linked sources
Open source record