CVE-2026-27603Public exploitNetwork attack vector

Unauthenticated chart data disclosure via unguarded filter endpoint

Published Mar 6, 2026 · Updated Mar 6, 2026

Missing authentication in Chartbrew before 4.8.4 allows remote attackers to read chart data through the chart filter endpoint. The POST /project/:project_id/chart/:chart_id/filter route in server/api/ChartRoute.js invokes updateChartData without verifyToken or checkPermissions, then returns the full chart response. No account or JWT is required, and sequential chart identifiers expose filtered chart data across projects and teams without enabling reported writes.

CVSS severity8.7
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Chartbrew before 4.8.4 allows remote attackers to read chart data through the chart filter endpoint. The POST /project/:project_id/chart/:chart_id/filter route in server/api/ChartRoute.js invokes updateChartData without verifyToken or checkPermissions, then returns the full chart response. No account or JWT is required, and sequential chart identifiers expose filtered chart data across projects and teams without enabling reported writes.

The record

CVE
CVE-2026-27603
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Chartbrew
Product
Chartbrew
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 4.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chartbrew · Chartbrewversion=< 4.8.4

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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