Meeting Room Booking System has an unauthenticated open redirect (CVE-2026-46688) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-46688

Meeting Room Booking System has an unauthenticated open redirect

Answer in brief

CVE-2026-46688 records a Medium severity (CVSS 6.9) vulnerability in Meeting Room Booking System has an unauthenticated open redirect. The current sources do not mark it as known exploited. The current feed maps meeting-room-booking-system/mrbs-code (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 12, 2026Updated Sep 9, 2026Source checked Sep 28, 2026First seen by HOL Aug 12, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps meeting-room-booking-system/mrbs-code (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
meeting-room-booking-system/mrbs-codegeneric	< 1.12.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for meeting-room-booking-system/mrbs-code.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source description

The Meeting Room Booking System (MRBS) is a PHP-based application for booking meeting rooms. Prior to version 1.12.2, an unauthenticated request can be made to redirect the user to a query-specified location. This allows an attacker to create a specially-crafted URL to an MRBS installation that will cause the user who clicks it to be redirected to the attacker-specified redirect URL, which could be a spoofed MRBS login page, for example. Version 1.12.2 contains a fix. No known workarounds are available.

Quoted source text, attributed separately from HOL analysis.