EUVD-2026-27823
GHSA-546v-xqjf-qgcr
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
2DescriptionNVD
Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure.
Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation.
The server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header).
The purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes.
AnalysisAI
Predictable session ID generation in Apache::Session::Generate::ModUniqueId 1.54-1.94 allows remote unauthenticated attackers to forge session tokens and hijack user sessions. The vulnerability stems from using Apache mod_unique_id values as session identifiers-these values are deterministic and constructed from publicly observable or easily guessable components (server IP, process ID, timestamp, counter). …
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RemediationAI
Within 24 hours: Identify all systems running Apache::Session versions 1.54-1.94 and document affected applications; assess whether sessions are actively used for authentication. Within 7 days: Implement session invalidation and force all users to re-authenticate using a different session generation mechanism; review application logs for abnormal session activity or impossible travel patterns indicating hijacking. …
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