CVE-2026-129134 is a high-severity (CVSS 8.1) CWE-640 vulnerability in meeting-room-booking-system mrbs-code. A fix is available — see the affected versions and patch details below.
MRBS before 1.13.0 contains a password reset poisoning vulnerability that allows unauthenticated attackers to redirect reset links by forging the Host header when $url_base is unset.…
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
MRBS before 1.13.0 contains a password reset poisoning vulnerability that allows unauthenticated attackers to redirect reset links by forging the Host header when $url_base is unset. Attackers can request a reset for a victim so AuthDb::notifyUser() emails a link pointing to their host, capturing the reset key when opened to take over accounts including administrators.
Affected Products
mrbs-codemeeting-room-booking-systemDetection & mitigation playbook
Vendor / applianceDetect
Inventory every meeting-room-booking-system mrbs-code deployment and check each version against the affected-products list above.
Fix
Apply the meeting-room-booking-system mrbs-code security patch or hotfix for CVE-2026-129134 on the affected version, following the vendor advisory for your exact build.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-129134 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.