CVE-2026-46382Network attack vector

Authenticated SSRF via unchecked calendar import URL

Published Aug 12, 2026 · Updated Aug 12, 2026

Server-side request forgery in MRBS before 1.12.2 allows remote authenticated users to probe internal resources through calendar import URLs. The calendar import path fetches a supplied URL without rejecting local or private addresses or file URIs, then attempts to read the response as iCal. Because fetched content is not returned, the consequence is limited to blind port and server-local file reconnaissance.

CVSS severity8.7
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in MRBS before 1.12.2 allows remote authenticated users to probe internal resources through calendar import URLs. The calendar import path fetches a supplied URL without rejecting local or private addresses or file URIs, then attempts to read the response as iCal. Because fetched content is not returned, the consequence is limited to blind port and server-local file reconnaissance.

The record

CVE
CVE-2026-46382
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Meeting Room Booking System
Product
MRBS
Classifications
CWE-918, T1190, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=< 1.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Meeting Room Booking System · MRBSversion=< 1.12.2

Published CVSS scores

8.7GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

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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