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CVE-2026-49952

Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7b2852c08037626c54755b7e890a19135ff8c9f9e8d8474aeec782606f260e8c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Discuz! X5.0","repo":"https://gitee.com/Discuz/DiscuzX","vendor":"Discuz!","versions":[{"lessThanOrEqual":"20260501","status":"affected","version":"20260320","versionType":"date"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-323","description":"Reusing a Nonce, Key Pair in Encryption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"http://seclists.org/fulldisclosure/2026/Jun/3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/adp/1/references/0
{"tags":["patch"],"url":"https://gitee.com/Discuz/DiscuzX/commit/9962dad52c4c6999dabaf91ecd70377c680ff3c6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/references/2
{"tags":["technical-description"],"url":"https://karmainsecurity.com/KIS-2026-09"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://karmainsecurity.com/chaining-bugs-in-discuz-from-race-condition-to-rce"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/discuz-x5-0-authentication-bypass-via-dbbak-php-encryption-oracle"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dbe5cb69f1a3a2804ba3e67e2c929bce4f55eb5ad037239f7fe0fa35f05d339b · sha256:acb0a33e588fbec1… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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