HighPublic exploit

Session ID Exposure and CORS Misconfiguration in WWBN AVideo

IdentifiersCVE-2026-33043CWE-942· Permissive Cross-domain Security…

CVE-2026-33043 affects WWBN AVideo, an open source video platform. In AVideo 25.0 and earlier, the endpoint /objects/phpsessionid.json.php returns the current PHP session ID to unauthenticated requests. The issue is compounded by the application's allowOrigin() behavior, which reflects arbitrary Origin headers into Access-Control-Allow-Origin and sets Access-Control-Allow-Credentials: true. This combination creates a cross-origin data exposure condition in which an attacker-controlled site can induce a victim's browser to make a credentialed cross-origin request and read back the victim's active session identifier. With the stolen PHP session ID, an attacker can hijack the victim's authenticated session and take over the account. The issue was fixed in version 26.0.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation enables theft of a victim's active PHP session identifier and subsequent session hijacking. Because the exposed value corresponds to the authenticated user's current session, an attacker can impersonate that user without needing credentials, resulting in full account takeover. The stated impact is high confidentiality and integrity loss, with no specific availability impact noted.

Mitigation

If you can’t patch tonight, do this now.

If immediate upgrade is not possible, disable or block access to /objects/phpsessionid.json.php at the web server or reverse proxy, especially from untrusted origins. Reconfigure CORS to use a strict allowlist of trusted origins and do not combine reflected origins with Access-Control-Allow-Credentials: true. Invalidate existing sessions after applying changes to reduce the value of previously exposed session IDs, and monitor for anomalous session reuse or account activity indicative of hijacking.

Remediation

Patch, then assume compromise.

Upgrade WWBN AVideo to version 26.0 or later, which contains the fix for CVE-2026-33043. The vulnerable behavior in /objects/phpsessionid.json.php should be removed or restricted so that session identifiers are never disclosed to unauthenticated or client-accessible contexts. CORS handling should also be corrected so that arbitrary Origin values are not reflected and credentialed cross-origin access is only allowed for explicitly trusted origins.

PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

WwbnAvideoapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app

cvefeed high severityNews

Mar 20, 2026

CVE-2026-33043 - AVideo affected by Session Hijacking via Unauthenticated Session ID Disclosure with Permissive CORS

An authentication/session exposure vulnerability in WWBN AVideo versions 25.0 and below that allows unauthenticated disclosure of the current PHP session ID and, through unsafe CORS behavior, enables cross-origin session theft and full account takeover.

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Exposure mapping

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Threat actor evidence

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Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5