CVE-2026-44549

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, Excel file attachments are previewed in an unsafe way. A crafted XLSX file payload can be used to cause the sheetjs function sheet_to_html to embed an XSS payload into the generated HTML. This is subsequently added to the DOM unsanitized via @html causing the payload to trigger. This vulnerability is fixed in 0.8.0.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: HIGH
CVSS score: 7.3 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Effective score: 7.3 / 10 HIGH source: CNA overview
CWE(s): CWE-79
Reserved: 2026-05-06
Published: 2026-05-15 23:45 UTC
Last updated: 2026-05-15 23:45 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/44xxx/CVE-2026-44549.json
Linked Threat: CVE-2026-44549 — Open WebUI: Stored XSS in excel file preview

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-15 22:16:52 UTC
NVD last modified: 2026-05-19 16:38:53 UTC
NVD CVSS v3.1: 7.3 / 10 HIGH source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Exploitability subscore: 2.1 / 10
Impact subscore: 5.2 / 10
EPSS score: 0.0001 (probability of exploitation in next 30 days)
EPSS percentile: 1.59% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-30639
Assigner: GitHub_M
Published: May 15, 2026, 9:45:16 PM
Updated: May 18, 2026, 12:47:12 PM
EUVD base score (CVSS 3.1): 7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
EUVD-reported EPSS: 0.0100
Vendors: open-webui
Products: open-webui (< 0.8.0)
Aliases: GHSA-jwf8-pv5p-vhmc

ENISA description: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, Excel file attachments are previewed in an unsafe way. A crafted XLSX file payload can be used to cause the sheetjs function sheet_to_html to embed an XSS payload into the generated HTML. This is subsequently added to the DOM unsanitized via @html causing the payload to trigger. This vulnerability is fixed in 0.8.0.

EUVD references (1)

https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc

Affected products (1)

Vendor	Product	Versions	Platforms
open-webui	open-webui	`< 0.8.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc x_refsource_CONFIRM

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc x_refsource_CONFIRM

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://nvd.nist.gov/vuln/detail/CVE-2026-44549 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-44549 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc security-advisories@github.com ExploitVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitVendor Advisory

Remediations (8)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-44549 | High severity in open-webui open-webui | CVETodo

web:cvetodo.com

CVE-2026-44549 is a CVSS 7.3 cross-site scripting in open-webui's open-webui. Full technical analysis, mitigations , and exploit status — updated in real time.

2026-05-18 00:33 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-18 00:33 UTC
Microsoft's May 2026 Patch Tuesday Fixes 130+ Vulnerabilities ...

web:windowsreport.com

Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]

2026-05-18 00:33 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-18 00:33 UTC
Microsoft Technical Security Notifications

web:www.microsoft.com

Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

2026-05-18 00:33 UTC
CVE-2026-44549 - High Vulnerability - TheHackerWire

web:www.thehackerwire.com

What is CVE-2026-44549 ? How severe is CVE-2026-44549 ? This vulnerability has a CVSS score of 7.3 out of 10, rated as High. High severity vulnerabilities pose significant risk and could allow attackers to gain elevated privileges or access sensitive data. How do I fix or mitigate CVE-2026-44549 ? When was CVE-2026-44549 disclosed?

2026-05-18 00:33 UTC
The May 2026 Security Update Review - Zero Day Initiative

web:www.zerodayinitiative.com

The obvious priority this month is the patch for Commerce, with its 15 bugs and deployment priority of 2. The Connect fix should also rank up there since both of its CVEs are CVSS 9s. Beyond those, it's a pretty typical month for Adobe, with most of the bugs either being cross-site scripting (XSS) or open-and-own code executions. Microsoft Patches for May 2026 This month, Microsoft released ...

2026-05-18 00:33 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-18 00:33 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-44549.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.8.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, Excel file attachments are previewed in an unsafe way. A crafted XLSX file payload can be used to cause the sheetjs function sheet_to_html to embed an XSS payload into the generated HTML. This is subsequently added to the DOM unsanitized via @html causing the payload to trigger. This vulnerability is fixed in 0.8.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-15T21:45:16.446Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc"
        }
      ],
      "source": {
        "advisory": "GHSA-jwf8-pv5p-vhmc",
        "discovery": "UNKNOWN"
      },
      "title": "Open WebUI: Stored XSS in excel file preview"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44549",
    "datePublished": "2026-05-15T21:45:16.446Z",
    "dateReserved": "2026-05-06T20:59:00.594Z",
    "dateUpdated": "2026-05-15T21:45:16.446Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}