CVE-2026-86271Public exploitNetwork attack vector

Cross-tenant asset access via site-agnostic authorization cache

Published Sep 7, 2026 · Updated Sep 9, 2026

Missing authorization in FluentCMS 0.0.1 through 0.0.5 allows remote authenticated users to access and alter other sites' assets. PermissionManager.HasAccess caches roles and permissions without keying them by siteId, while file and folder services accept object UUIDs without checking the owning site's permissions. A site administrator in a multi-site deployment can enumerate sites and read, upload, rename, move, or delete another site's assets.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Missing authorization in FluentCMS 0.0.1 through 0.0.5 allows remote authenticated users to access and alter other sites' assets. PermissionManager.HasAccess caches roles and permissions without keying them by siteId, while file and folder services accept object UUIDs without checking the owning site's permissions. A site administrator in a multi-site deployment can enumerate sites and read, upload, rename, move, or delete another site's assets.

The record

CVE
CVE-2026-86271
Published
Sep 7, 2026
Updated
Sep 9, 2026
Vendor
FluentCMS
Product
FluentCMS
Classifications
CWE-863, CWE-862
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.1
  2. Affected versionversion=0.0.2
  3. Affected versionversion=0.0.3
  4. Affected versionversion=0.0.4
  5. Affected versionversion=0.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

FluentCMS · FluentCMSversion=0.0.1; version=0.0.2; version=0.0.3; version=0.0.4; version=0.0.5

Published CVSS scores

4.7VulDB CNACVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
4.7VulDB CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.8VulDB CNAAV:N/AC:L/Au:M/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-862Missing Authorization

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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