CVE-2026-109290

DiscoveredOct 12, 2026UpdatedOct 23, 2026

Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute script by uploading crafted DOCX attachments. Attackers can embed an OOXML altChunk HTML part or script-scheme hyperlink to steal a previewing administrator's session token from local storage and take over the instance.

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CVSS v3.1

8.7 HIGH

EPSS

0.31%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Oct 24, 2026 → Oct 26, 2026

▲ 0.06pp

0.26% → 0.31% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

ScopeCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityNONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Connections

2 relationships

Timeline

disclosure → media coverage

Oct 12, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 23, 2026