Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.
CVE-2026-45316
LOWNVD 3.53.5—Elevated
EchelonGraph scoreMEDIUM confidence
This low-severity CVE scores 3.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 88% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
3.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 3.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 3.5
- EG Score
- 3.5(medium)
- EPSS
- 12.3%
- KEV
- Not listed
Published
May 15, 2026
Last Modified
May 18, 2026
References (2)
- security-advisories@githubhttps://github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j
Vendor Advisories for CVE-2026-45316(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Frequently asked(5)
What is CVE-2026-45316?
CVE-2026-45316 is a low vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can…
When was CVE-2026-45316 disclosed?
CVE-2026-45316 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45316 actively exploited?
CVE-2026-45316 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45316?
CVE-2026-45316 has a CVSS v3 base score of 3.5 (NVD).
How do I remediate CVE-2026-45316?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45316, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-45316
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