Risk Letters

Exploited vulnerability

CVE-2021-48017

TLP:CLEAR

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

OrbiTeam BSCW Server 5.x before 5.2.5 and 7.x before 7.4.4 contains an unauthenticated path traversal vulnerability in the style_name parameter of the theme operation. Attackers can send GET requests to /pub/bscw.cgi/?op=theme with ../ sequences in style_name to read local files such as /etc/passwd. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-22.

Facts

  • Vendor: OrbiTeam
  • Product: BSCW Server
  • EPSS (probability of exploitation within 30 days): 0.4 %
  • First known exploitation: 22 October 2026
  • First seen by Risk Letters: 22 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD