Open WebUI: Full SSRF Vulnerability in the RAG Web Search Feature
Published May 15, 2026
8.5
HIGHCVSS 3.1
EPSS 0.33%
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, validate_url() in backend/open_webui/retrieval/web/utils.py calls validators.ipv6(ip, private=True), but the validators library does NOT implement the private keyword for IPv6 — the call raises a ValidationError (which is falsy in a boolean context), so every IPv6 address passes the filter. In addition, IPv4-mapped IPv6 (::ffff:10.0.0.1) bypasses the IPv4 check entirely, and several reserved IPv4 ranges (0.0.0.0/8, 100.64.0.0/10, 192.0.0.0/24, etc.) are not blocked. This vulnerability is fixed in 0.9.0.
Affected products
-
- Version < 0.9.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Open-Webui | Open-Webui | n/a |
|
- < 0.9.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.33% (0.00328) | 23.56th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.29% (0.00286) | 20.09th | v5 (v2026.06.15) |
| May 16, 2026 | 0.03% (0.00028) | 8.21th | v4 (v2025.03.14) |
References (5)
- https://github.com/advisories/GHSA-4v7r-f4w8-8972 Advisory
- https://github.com/advisories/GHSA-c6xv-rcvw-v685
- https://github.com/open-webui/open-webui/releases/tag/v0.9.0
- https://github.com/open-webui/open-webui/security/advisories/GHSA-4v7r-f4w8-8972 exploitx_refsource_CONFIRMMitigationVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-45331
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-4v7r-f4w8-8972 | Advisory | |
| https://github.com/advisories/GHSA-c6xv-rcvw-v685 | ||
| https://github.com/open-webui/open-webui/releases/tag/v0.9.0 | ||
| https://github.com/open-webui/open-webui/security/advisories/GHSA-4v7r-f4w8-8972 | exploitx_refsource_CONFIRMMitigationVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-45331 |
Change history (0)
No recorded changes yet.