CVE-2026-2439

Summary

Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,

  • There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.
  • The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the –random option. Note that the system time is shared in HTTP responses.
  • UUIDs are identifiers whose mere possession grants access, as per RFC 9562.
  • The output of the built-in rand() function is predictable and unsuitable for security applications.

Affected Software

VendorProductVersion RangeStatus
BVAConcierge::Sessions0.8.1 < 0.8.5affected

Weaknesses

  • CWE-340: CWE-340 Generation of Predictable Numbers or Identifiers
  • CWE-338: CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References