CVE Explorer

CVE-2026-39903

Simple Machines Forum 2.1 prior to commit 7d048f8 and 3.0 prior to commit a7875e8 contains an authorization bypass vulnerability in Sources/Actions/AttachmentApprove.php where a single-character operator error causes the permission check to always pass regardless of user permissions. An authenticated low-privileged user can approve, reject, or delete any pending attachments on any board without holding the required approve_posts permission, bypass moderation queues for their own uploads, and enu

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f306d9ee2254ee47f56776e23f7814d429b0f4e18f566e1913bb3a327413905b

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","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:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NO…

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion

{"defaultStatus":"affected","packageURL":"pkg:github/SimpleMachines/SMF","product":"SMF","repo":"https://github.com/SimpleMachines/SMF","vendor":"SimpleMachines","versions":[{"lessThanOrEqual":"2.1.7","status":"affected","version":"2.1.0","versionType":"semver"},{"status":"unaffected","version":"7d048f8d66aab9af51cd6ee110fbad103cf673e8","versionType":"git"},{"status":"affected","version":"3.0.0","versionType":"semver"},{"status":"unaffected","version":"a7875e876a647572dd4c45da881b875092caac3d","versionType":"git"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/metrics/1/cvssV3_1

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-863","description":"Incorrect Authorization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions

{"name":"Patch Commit (v2.1)","tags":["patch"],"url":"https://github.com/SimpleMachines/SMF/commit/7d048f8d66aab9af51cd6ee110fbad103cf673e8"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/references/2

{"name":"Patch Commit (v3.0)","tags":["patch"],"url":"https://github.com/SimpleMachines/SMF/commit/a7875e876a647572dd4c45da881b875092caac3d"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/references/3

{"name":"Pull Request (v3.0)","tags":["issue-tracking"],"url":"https://github.com/SimpleMachines/SMF/pull/9181"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/references/1

{"name":"Pull Request (v2.1)","tags":["issue-tracking"],"url":"https://github.com/SimpleMachines/SMF/pull/9182"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/references/0

{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/simple-machines-forum-authorization-bypass-via-attachmentapprove-php"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a474ebd11e6cf3f3f41641a41720156bcfc15ce2242d9aeefec775633541d89f · sha256:33e6c74db27f8b29… · /containers/cna/references/4

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.

← Back to CVE Explorer