CVE-2023-46733Network attack vector

Session fixation via token-type-blind identifier comparison

Published Nov 10, 2023 · Updated Sep 3, 2024

Session fixation in Symfony Security HTTP allows remote authenticated users to preserve a chosen session ID across successful login. SessionStrategyListener returns without migrating the session when the user identifier is unchanged, even if the authentication token changes from a partially authenticated class to a fully authenticated class. The affected flow requires the same identifier across both token types, leaving the fully authenticated session bound to an identifier already known to remote authenticated users.

CVSS severity6.5
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Symfony Security HTTP allows remote authenticated users to preserve a chosen session ID across successful login. SessionStrategyListener returns without migrating the session when the user identifier is unchanged, even if the authentication token changes from a partially authenticated class to a fully authenticated class. The affected flow requires the same identifier across both token types, leaving the fully authenticated session bound to an identifier already known to remote authenticated users.

The record

CVE
CVE-2023-46733
Published
Nov 10, 2023
Updated
Sep 3, 2024
Vendor
Symfony
Product
Symfony
Classifications
CWE-384, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 5.4.21, < 5.4.31
  2. Affected versionversion=>= 6.2.7, < 6.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Symfony · Symfonyversion=>= 5.4.21, < 5.4.31; version=>= 6.2.7, < 6.3.8

Published CVSS scores

6.5NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
T1550.004Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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