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CVE-2026-129133VulnerabilityPublished

MRBS before 1.13.0 contains a CSV formula injection vulnerability that allows authenticated users to inject

Source GCVE Database

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Authoritative record:CVE-2026-129133· Medium 5.1

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

CVSS 4.0 base score
5.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.05.1
CNA (VulnCheck)CVSS 3.15.4
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
meeting-room-booking-systemmrbs-codeAffected
  • <1.13.0
Fixed in
  • 1.13.0
GitHubmrbs-codepkg:github/mrbs-codeOther threatsAffected
  • <1.13.0
Fixed in
  • 1.13.0

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

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