CVE-2026-63177Public exploitNetwork attack vector

Authenticated restricted-backend access via raw URI matching

Published Aug 11, 2026 · Updated Aug 11, 2026

Incorrect authorization in CISA Malcolm before 26.07.0 allows remote authenticated users to reach restricted backends via crafted paths. The Nginx OpenResty check_rbac function matches the raw request URI against path_role_envs and returns success when no rule matches, while Nginx routes the normalized path. Low-privilege access is required; a traversal prefix can expose protected data or functions and permit unauthorized telemetry uploads where backends do not recheck roles.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in CISA Malcolm before 26.07.0 allows remote authenticated users to reach restricted backends via crafted paths. The Nginx OpenResty check_rbac function matches the raw request URI against path_role_envs and returns success when no rule matches, while Nginx routes the normalized path. Low-privilege access is required; a traversal prefix can expose protected data or functions and permit unauthorized telemetry uploads where backends do not recheck roles.

The record

CVE
CVE-2026-63177
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Cybersecurity and Infrastructure Security Agency (CISA)
Product
Malcolm
Classifications
CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=< 26.07.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybersecurity and Infrastructure Security Agency (CISA) · Malcolmversion=< 26.07.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

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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