EUVD-2026-52966
GHSA-6whc-fpp2-93j2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered reflected XSS; no attacker authentication required; victim click mandatory; scope changes to browser context with bounded confidentiality and integrity impact only.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
A reflected cross-site scripting (XSS) vulnerability in the Forum posting function of O2OA v10 allows attackers to execute arbitrary Javascript in the context of the victim's browser via a crafted URL.
AnalysisAI
Reflected XSS in O2OA v10's Forum posting function allows an unauthenticated remote attacker to execute arbitrary JavaScript in a victim's browser by convincing them to click a crafted URL. The Changed scope (S:C) in the CVSS vector confirms the exploit breaks out of the application's origin into the broader browser context, enabling session token theft or unauthorized actions on behalf of the victim. No active exploitation is confirmed (not in CISA KEV), and EPSS at 0.22% (12th percentile) alongside SSVC 'Exploitation: none' indicate low real-world exploitation activity at time of analysis.
Technical ContextAI
O2OA is a Chinese open-source enterprise collaboration platform offering office automation features including forums, workflows, and document management. CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause: user-supplied input passed via URL parameters to the Forum posting function is reflected directly into the HTTP response without adequate encoding or sanitization. This classic reflected XSS pattern means the payload is not stored server-side but is executed immediately when the crafted URL is loaded in the victim's browser. The CVSS Scope:Changed metric indicates the vulnerability's impact escapes the O2OA application's security context and affects the victim's browser environment, consistent with the ability to steal session cookies set with inadequate HttpOnly flags or perform DOM-based actions. The CPE data provided (cpe:2.3:a:n/a:n/a) is non-specific and not useful for precise version matching; affected product identification relies solely on the CVE description and vendor references.
RemediationAI
No specific patched version is confirmed in the available data; organizations should monitor the vendor's download page at https://www.o2oa.net/download.html for an update addressing this vulnerability. As an interim compensating control, deploying a strict Content Security Policy (CSP) header (e.g., script-src 'self') significantly reduces reflected XSS impact by blocking inline script execution, though this may require testing for compatibility with O2OA's own JavaScript. Ensuring session cookies are set with the HttpOnly flag prevents JavaScript-based session token exfiltration, directly limiting the most impactful exploitation path. A Web Application Firewall (WAF) with XSS detection rules applied to the forum endpoint can filter crafted payloads in transit, though WAF bypass techniques exist and this is not a substitute for patching. Restricting the O2OA forum function to internal network access only eliminates the external attack surface for the AV:N vector.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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