{"id":"GHSA-q4x6-6mm2-crg9","aliases":["CVE-2026-39368"],"title":"WWBN AVideo has a Live restream log callback flow enabling stored SSRF to internal services","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"MODERATE","description":"## Summary\n\nThe Live restream log callback flow accepted an attacker-controlled `restreamerURL` and later fetched that stored URL server-side, enabling stored SSRF for authenticated streamers.\n\nThe vulnerable flow allowed a low-privilege user with streaming permission to store an arbitrary callback URL and trigger server-side requests to loopback or internal HTTP services through the restream log feature.\n\n## Details\n\nThe vulnerable chain was:\n\n1. `plugin/Live/view/getRestream.json.php` exposed a fresh `tokenForAction`\n2. `plugin/Live/view/Live_restreams/verifyTokenForAction.json.php` exchanged it for a valid `responseToken`\n3. `plugin/Live/view/Live_restreams_logs/add.json.php` accepted attacker-controlled `restreamerURL`\n4. `plugin/Live/view/getRestream.json.php` and `plugin/Live/view/Live_restreams/getAction.json.php` later fetched that stored URL server-side\n\nThe original issue existed because the `responseToken` was accepted, but the callback destination was not tightly constrained to trusted restreamer endpoints.\n\nThe maintainer confirmed the vulnerability and stated that the fix was applied by validating `restreamerURL` at storage time and re-validating the log-entry branch before use. The maintainer also noted that the `m3u8` field follows the same general pattern but is not server-fetched in the current flow.\n\n## Proof of concept\n\n1. Log in as a non-admin user with streaming permission.\n2. Create a normal restream destination.\n3. Trigger `plugin/Live/view/Live_restreams/testRestreamer.json.php` to create a live transmission history row.\n4. Call:\n\n```text\nGET /plugin/Live/view/getRestream.json.php?live_transmitions_history_id=<id>&restreams_id=<id>\n```\n\n5. Extract `tokenForAction` from the returned URL.\n6. Exchange it for `responseToken` via:\n\n```text\nPOST /plugin/Live/view/Live_restreams/verifyTokenForAction.json.php\n```\n\n7. Store a loopback callback URL:\n\n```text\nPOST /plugin/Live/view/Live_restreams_logs/add.json.php\nrestreamerURL=http://127.0.0.1:9999/index.php\n```\n\n8. Trigger `getRestream.json.php` again.\n9. Observe that the returned response now contains the JSON body from the loopback-only service.\n\n## Impact\n\nAn authenticated streamer can cause the AVideo server to send HTTP requests to loopback or internal services and return the response through normal application endpoints by storing a malicious `restreamerURL` in the restream log flow. Because the callback destination was not constrained to trusted restreamer endpoints, the application could be used as a proxy to internal-only services that trust network locality. Successful exploitation can expose local admin panels, internal-only APIs, cloud metadata services if reachable, or other sensitive internal responses available from the application host.\n\n\n## Recommended fix\n\n- Validate `restreamerURL` against explicitly configured restreamer endpoints at storage time\n- Re-validate the stored callback URL before server-side fetch\n- Bind `responseToken` to the expected restream row and callback host\n- Apply SSRF validation to the initial destination of every server-side fetch, not only redirect targets\n- Ignore or reject user-supplied callback hosts that do not match trusted configuration","severity":"medium","score":6.5,"published":"2026-04-08T00:08:42.000Z","modified":"2026-09-10T03:51:02.726Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"WWBN/AVideo","sources":[{"name":"OSV · GHSA-q4x6-6mm2-crg9","url":"https://osv.dev/vulnerability/GHSA-q4x6-6mm2-crg9"}],"ranges":[{"events":[{"introduced":"0"},{"last_affected":"26.0"}],"type":"ECOSYSTEM"}],"versions":[],"fixed":[]}],"sourceAffected":[],"references":["https://github.com/WWBN/AVideo/security/advisories/GHSA-q4x6-6mm2-crg9","https://nvd.nist.gov/vuln/detail/CVE-2026-39368","https://github.com/WWBN/AVideo"],"sources":[{"name":"OSV","id":"GHSA-q4x6-6mm2-crg9","modified":"2026-09-10T03:51:02.726701800Z","url":"https://osv.dev/vulnerability/GHSA-q4x6-6mm2-crg9"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T23:25:34.350Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}