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CVE-2026-70481· NVD / CVE Program· CNA GitHub_M

Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

Noroxi assessment

Priority: Monitor (action score 21/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.42% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: open-webui open-webui 0.11.0.

Low priority for now. Upgrade to open-webui open-webui 0.11.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access is the same grant a member needs to post, any ordinary participant in a shared standard channel could rewrite or permanently delete another participant message, while group and direct message handlers enforced authorship. This issue is fixed in 0.11.0.

MediumCVSS 5.4 · v3.1—Proof of concept Fix available
Published
Aug 4, 2026
Updated
Sep 18, 2026
EPSS
0.4% · 35th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.4
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-70481

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
openwebuiopen webui

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openwebui open webui0.5.0 and later · before 0.11.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • open-webui open-webui

    • >= 0.5.0, < 0.11.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
PyPIopen-webuifrom 0.5.0 · before 0.11.00.11.0

Same product

openwebui: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-44566Open WebUI: Arbitrary File Upload and Path Traversal
    39Monitor
  • CVE-2026-56400open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
    36Monitor
  • CVE-2026-59216Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-70479Aug 4, 2026 · Open WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playwright web loader
    30Monitor
  • ← EarlierCVE-2026-70480Aug 4, 2026 · Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering
    16Monitor
  • Later →CVE-2026-70482Aug 4, 2026 · Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
open-webui open-webui0.11.0 · descriptionVendor (CNA)
PyPI:open-webui0.11.0Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-08-04

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-1 d
  2. Published
  3. TodayOct 21, 2026+78 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5401042 days apartOpen WebUI: Forged chat-file link allows cross-user file read and deletion
    33Monitor
  • CVE-2026-4530181 days apartOpen WebUI: Missing permission check in files API allows authenticated users to list, access and delete every uploaded file
    32Monitor
  • CVE-2026-5401242 days apartOpen WebUI: Forged model meta.knowledge allows cross-user file read and deletion
    28Monitor
  • CVE-2026-4455681 days apartOpen WebUI: responses passthrough endpoint lacks access control authorization
    28Monitor
  • CVE-2026-5401542 days apartOpen WebUI: Prompt history IDOR: unbound history_id allows cross-prompt read and deletion
    25Monitor
  • CVE-2025-63681243 days apartopen-webui v0.6.33 is vulnerable to Incorrect Access Control.
    17Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records