EUVD-2026-75421
GHSA-277g-79xq-9cwq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network attacker, low complexity, requires victim admin to load crafted page (UI:R), integrity-only impact limited to subscriber count (I:L), no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
1DescriptionCVE.org
WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 (master, 2026-08-23) contains a cross-site request forgery vulnerability in the CustomizeUser plugin's plugin/CustomizeUser/setSubscribers.json.php endpoint. The script reads users_id and ExtraSubscribers from $_REQUEST and calls User::setExtraSubscribers() without requiring a POST request or a valid CSRF token; autoCSRFGuard() is applied only to POST requests to *.json.php, and the mutation does not pass through ObjectYPT::save()/isUntrustedRequest(), so a cross-origin GET succeeds. An unauthenticated remote attacker who induces a logged-in administrator to load a crafted page (for example an <img> tag pointing at the endpoint) can forge the ExtraSubscribers count displayed on any user's channel. The CustomizeUser plugin is enabled by default, and no patched version was available at the time of reporting.
AnalysisAI
Cross-site request forgery in AVideo's default-enabled CustomizeUser plugin allows an unauthenticated remote attacker to forge the ExtraSubscribers count on any user channel by inducing a logged-in administrator to load a crafted page containing an img tag. The root cause is that the setSubscribers.json.php endpoint accepts state-mutating GET requests via the $_REQUEST superglobal without any CSRF token validation, because autoCSRFGuard() is scoped exclusively to POST requests and the mutation path bypasses ObjectYPT::save()/isUntrustedRequest() checks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be a logged-in AVideo administrator or a user with sufficient privileges to have their session recognized by the setSubscribers.json.php endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 with UI:P (victim interaction required) and VI:L (low integrity impact) accurately reflects the constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis; the GitHub Security Advisory (https://github.com/WWBN/AVideo/security/advisories/GHSA-p9c3-prq7-g8xc) confirmed no fixed version was available at reporting time. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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