MRBS before 1.13.0 contains a CSV formula injection vulnerability that allows authenticated users to inject
Source GCVE Database
Not known to be exploited · CVSS 5.1 Medium : upgrade to 1.13.0 when convenient.
Data as of 13 Nov 2026, 20:02 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 5.1 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 5.4 |
- Patch
- Available – fixed in 1.13.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 13 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Upgrade mrbs-code to 1.13.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| meeting-room-booking-systemmrbs-code | Affected
| Fixed in
|
GitHubmrbs-codepkg:github/mrbs-codeOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, restrict CSV export access to trusted users and educate privileged users about the risks of opening untrusted CSV files with spreadsheet software.
Description
MRBS versions prior to 1.13.0 have a CSV formula injection vulnerability that allows authenticated users to inject malicious spreadsheet formulas. This occurs because the escape() function in web/report.php does not properly neutralize leading formula characters. Attackers can embed formulas in booking names, descriptions, or custom fields that execute when privileged users open exported CSV reports, potentially leading to data exfiltration or command execution via DDE.
References
- github.com/meeting-room-booking-system/mrbs-code/security/advisories/GHSA-9rvp-v4ff-wpwr (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-129133 (opens in a new tab)
- github.com/meeting-room-booking-system/mrbs-code/commit/92f6f5610072ddb9e1b38074c410fc8be56947ed (opens in a new tab)
- github.com/meeting-room-booking-system/mrbs-code/blob/299686ed64174a66448699f5ca0fb5e0e0ea9faa/web/report.php (opens in a new tab)
- github.com/meeting-room-booking-system/mrbs-code/releases/tag/v1.13.0 (opens in a new tab)
- vulncheck.com/advisories/mrbs-before-1.13.0-csv-formula-injection-via-report-export (opens in a new tab)