CVE-2020-8088Public exploitNetwork attack vector

Unauthenticated login bypass via loose hash comparison

Published Jan 27, 2020 · Updated Aug 4, 2024

Type confusion in UseBB 1.0.12 allows remote attackers to bypass login authentication through crafted password hashes. The sources/panel_login.php check compares md5(stripslashes($_POST['passwd'])) with the stored hash using PHP's loose != operator, so magic hashes beginning with 0e and digits compare equal. An unauthenticated network attacker can submit a colliding password and obtain the targeted account's access, including administrative access when an administrator account is targeted.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in UseBB 1.0.12 allows remote attackers to bypass login authentication through crafted password hashes. The sources/panel_login.php check compares md5(stripslashes($_POST['passwd'])) with the stored hash using PHP's loose != operator, so magic hashes beginning with 0e and digits compare equal. An unauthenticated network attacker can submit a colliding password and obtain the targeted account's access, including administrative access when an administrator account is targeted.

The record

CVE
CVE-2020-8088
Published
Jan 27, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1013, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1013Inconsistent Comparison
T1190Exploit Public-Facing Application

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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