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CVE-2026-8426

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/prepare_remote_upgrade/<remoteMPID>. An attacker who controls the remote package returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade() method to execute in a single browser navigation. This results in remote code execution as the web server user.   In order to be vulnerable, the victim must be passing canInstallPackages, victim site m
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f2705655c69f1277f0e082669190def67fe09611d4a41c436bb648a9c62052b9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-352","description":"CWE-352 Cross-Site request forgery (CSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-829","description":"CWE-829 Inclusion of functionality from untrusted control sphere","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://github.com/concretecms/concretecms","defaultStatus":"unaffected","product":"Concrete CMS","repo":"https://github.com/concretecms/concretecms","vendor":"Concrete CMS","versions":[{"lessThanOrEqual":"9.5.0","status":"affected","version":"5.0","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.5,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImp…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-352","description":"CWE-352 Cross-Site request forgery (CSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-829","description":"CWE-829 Inclusion of functionality from untrusted control sphere","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"tags":["release-notes"],"url":"https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db35d34d03a15cafe7a43b601d894aa0e6946c1381dd3937dc05decc822b0a0f · sha256:4baae33b997bb048… · /containers/cna/references/0

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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