EUVD-2026-69725
GHSA-748m-wrhq-3hc2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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
Network-accessible unauthenticated endpoint yields only hash oracle output (VC:L); no integrity or availability impact applies.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
1DescriptionCVE.org
WWBN AVideo through commit 9c39d8c8 contains an incomplete authentication bypass in encryptPass.json.php that allows unauthenticated attackers to compute valid HMAC tokens using the public site URL and current time. Attackers can forge authentication tokens by computing hash_hmac with the site's base URL as the key and submit arbitrary passwords to receive encrypted hashes, enabling offline precomputation attacks against stolen password databases.
AnalysisAI
Unauthenticated HMAC token forgery in WWBN AVideo through commit 9c39d8c8 exposes a cryptographic oracle via encryptPass.json.php, allowing any remote attacker to compute valid authentication tokens using only the publicly known site base URL as the HMAC key. The endpoint accepts arbitrary plaintext passwords and returns AVideo-formatted encrypted hashes, functioning as an unrestricted hash oracle that enables offline precomputation attacks - particularly dangerous when combined with a separately stolen AVideo credential database. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only network-level access to the encryptPass.json.php endpoint - no authentication, account credentials, or special configuration is needed, as the HMAC key is the site's public base URL which any visitor can observe. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 with AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N accurately captures the direct, standalone impact: low confidentiality exposure (hash oracle output for attacker-chosen inputs) with no integrity or availability consequence. … 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 | Apply the fix referenced in vendor advisory GHSA-q92q-q2f7-v4fc at https://github.com/WWBN/AVideo/security/advisories/GHSA-q92q-q2f7-v4fc, which addresses the predictable HMAC key derivation in encryptPass.json.php. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-321 – Use of Hard-coded Cryptographic Key
View allSame technique Authentication Bypass
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External POC / Exploit Code
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