CVE-2020-12258Public exploitNetwork attack vector

Account takeover via reused preauthentication session identifier

Published May 18, 2020 · Updated Aug 4, 2024

Session fixation in rConfig 3.9.4 allows remote attackers to take over a user's account by forcing a chosen PHPSESSID. The login flow preserves the preauthentication session identifier instead of expiring it and issuing a fresh randomized value. Exploitation requires a victim to authenticate with an attacker-chosen cookie, demonstrated by chaining either cited cross-site scripting flaw.

CVSS severity9.1
Critical
EPSS probability1.71%
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 rConfig 3.9.4 allows remote attackers to take over a user's account by forcing a chosen PHPSESSID. The login flow preserves the preauthentication session identifier instead of expiring it and issuing a fresh randomized value. Exploitation requires a victim to authenticate with an attacker-chosen cookie, demonstrated by chaining either cited cross-site scripting flaw.

The record

CVE
CVE-2020-12258
Published
May 18, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-384
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.4NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-384Session Fixation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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