CVE-2026-45396

Q: How do I fix CVE-2026-45396?

Upgrade open webui to 0.9.5 or later.

Q: Is CVE-2026-45396 being actively exploited?

Not that we know of. CVE-2026-45396 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.

Q: How severe is CVE-2026-45396?

CVE-2026-45396 has a CVSS v3 base score of 5.4, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-45396 affect?

Published advisories record a fix for open webui (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.4

CVSS v3

NVD

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, the POST /api/v1/evaluations/feedback endpoint in Open WebUI v0.9.2 is vulnerable to mass assignment via FeedbackForm, which uses model_config = ConfigDict(extra='allow'). Due to an insecure dictionary merge order in insert_new_feedback(), an authenticated attacker can inject a user_id field in the request body that overwrites the server-derived value, creating feedback records attributed to any arbitrary user. This corrupts the model evaluation leaderboard (Elo ratings) and enables identity spoofing. This vulnerability is fixed in 0.9.5.

CWE-915

How to fix

Remediation Available

open webuiNVD

Affected:< 0.9.5Fixed in:0.9.5CVE-2026-45396derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Exploit1

github.com

Related Vulnerabilities

Other CWE-915 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-4068	Medium	5.4	34%	-	Fix
CVE-2024-5452	Critical	9.8	26%	-	Fix
CVE-2026-30822	High	7.7	13%	-	Fix
CVE-2026-50160	Critical	10.0	8.6%	-	Fix
CVE-2026-33453	Critical	10.0	6.2%	-	-
CVE-2026-41277	High	8.8	3.1%	-	Fix

Common questions

How do I fix CVE-2026-45396?

Upgrade open webui to 0.9.5 or later.

Is CVE-2026-45396 being actively exploited?

Not that we know of. CVE-2026-45396 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.

How severe is CVE-2026-45396?

CVE-2026-45396 has a CVSS v3 base score of 5.4, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-45396 affect?

Published advisories record a fix for open webui (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-19.