CVE-2025-15586Public exploitNetwork attack vector

Account takeover via loose MD5 comparison

Published Feb 19, 2026 · Updated Feb 19, 2026

Authentication bypass in Open Game Panel OGP-Website before commit 52f865a allows remote attackers to access accounts via crafted passwords. The login and API-token paths in index.php and ogp_api.php use PHP's loose equality operator to compare attacker-controlled MD5 results with stored password hashes. Exploitation requires a known username whose stored MD5 hash has numeric 0e form; success grants that account's web session or API token.

CVSS severity10.0
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Open Game Panel OGP-Website before commit 52f865a allows remote attackers to access accounts via crafted passwords. The login and API-token paths in index.php and ogp_api.php use PHP's loose equality operator to compare attacker-controlled MD5 results with stored password hashes. Exploitation requires a known username whose stored MD5 hash has numeric 0e form; success grants that account's web session or API token.

The record

CVE
CVE-2025-15586
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Open Game Panel
Product
OGP-Website
Classifications
CWE-287, CAPEC-115, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2026Record 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=0 <=52f865a4fba763594453068acf8fa9e3fc38d663

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Game Panel · OGP-Websiteversion=0 <=52f865a4fba763594453068acf8fa9e3fc38d663

Published CVSS scores

10.0PRJBLKCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
CAPEC-115Authentication Bypass
T1078Valid Accounts

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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