CVE-2026-49952Public exploitNetwork attack vector

Authentication bypass via cross-context token reuse

Published Jun 15, 2026 · Updated Jun 15, 2026

Authentication bypass in Discuz! X 5.0 releases 20260320 through 20260501 allows remote attackers to export or import the database. In standalone mode, config_ucenter.php copies authkey into UC_KEY, so logging_ctl::logging_more() signs an attacker-controlled username for acceptance by api/db/dbbak.php. No credentials or user interaction are required; database export exposes user data and password hashes, while a timed import enables arbitrary-user impersonation.

CVSS severity9.3
Critical
EPSS probability4.72%
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 Discuz! X 5.0 releases 20260320 through 20260501 allows remote attackers to export or import the database. In standalone mode, config_ucenter.php copies authkey into UC_KEY, so logging_ctl::logging_more() signs an attacker-controlled username for acceptance by api/db/dbbak.php. No credentials or user interaction are required; database export exposes user data and password hashes, while a timed import enables arbitrary-user impersonation.

The record

CVE
CVE-2026-49952
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Comsenz
Product
Discuz! X
Classifications
CWE-323, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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=20260320 <=20260501

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Comsenz · Discuz! Xversion=20260320 <=20260501

Published CVSS scores

9.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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.

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-323Reusing a Nonce, Key Pair in Encryption
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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