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CodeIgniter Session Fixation Vulnerability

Critical severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Jun 17, 2025

Package

composer codeigniter/framework (Composer)

Affected versions

< 3.1.10

Patched versions

3.1.10

Description

A Session Fixation issue exists in CodeIgniter before 3.1.10 because session.use_strict_mode in the Session Library was mishandled.

References

Published by the National Vulnerability Database Jun 17, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Jul 25, 2023
Last updated Jun 17, 2025

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(61st percentile)

Weaknesses

CVE ID

CVE-2018-12071

GHSA ID

GHSA-g434-3q2j-hj4r

Source code

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