{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-34739", "tracking": { "current_release_date": "2026-04-01T23:33:13.116076Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-34739", "initial_release_date": "2026-03-31T21:26:43.440461Z", "revision_history": [ { "date": "2026-03-31T21:26:43.440461Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-31T21:26:45.497439Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-31T21:39:17.769411Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-31T21:39:24.962856Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-04-01T14:40:08.797011Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-04-01T14:40:11.128390Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-04-01T15:06:19.258045Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-01T15:08:07.199404Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-04-01T22:11:13.701804Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-04-01T22:11:18.520495Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-04-01T23:01:13.793867Z", "number": "11", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-04-01T23:01:16.851127Z", "number": "12", "summary": "NCSC Score updated." } ], "status": "interim", "version": "12" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=26.0", "product": { "name": "vers:unknown/<=26.0", "product_id": "CSAFPID-5893889", "product_identification_helper": { "cpe": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "AVideo" } ], "category": "vendor", "name": "WWBN" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-34739", "cwe": { "id": "CWE-79", "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')" }, "notes": [ { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the User_Location plugin's testIP.php page reflects the ip request parameter directly into an HTML input element without applying htmlspecialchars() or any other output encoding. This allows an attacker to inject arbitrary HTML and JavaScript via a crafted URL. Although the page is restricted to admin users, AVideo's SameSite=None cookie configuration allows cross-origin exploitation, meaning an attacker can lure an admin to a malicious link that executes JavaScript in their authenticated session. At time of publication, there are no publicly available patches.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34739" }, { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the User_Location plugin's testIP.php page reflects the ip request parameter directly into an HTML input element without applying htmlspecialchars() or any other output encoding. This allows an attacker to inject arbitrary HTML and JavaScript via a crafted URL. Although the page is restricted to admin users, AVideo's SameSite=None cookie configuration allows cross-origin exploitation, meaning an attacker can lure an admin to a malicious link that executes JavaScript in their authenticated session. At time of publication, there are no publicly available patches.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34739.json" }, { "category": "description", "text": "## Summary\n\nThe User_Location plugin's `testIP.php` page reflects the `ip` request parameter directly into an HTML input element without applying `htmlspecialchars()` or any other output encoding. This allows an attacker to inject arbitrary HTML and JavaScript via a crafted URL. Although the page is restricted to admin users, AVideo's `SameSite=None` cookie configuration allows cross-origin exploitation, meaning an attacker can lure an admin to a malicious link that executes JavaScript in their authenticated session.\n\n## Details\n\nAt `plugin/User_Location/testIP.php:16`, the `ip` parameter is read from the request without sanitization:\n\n```php\n$ip = $_REQUEST['ip'];\n```\n\nAt line 34, the value is echoed directly into an HTML input element's `value` attribute:\n\n```php\n\">\n```\n\nNo `htmlspecialchars()` is applied, allowing an attacker to break out of the `value` attribute and inject arbitrary HTML/JavaScript.\n\nWhile the page requires admin authentication to access, AVideo sets session cookies with `SameSite=None`. When an admin clicks a link from an external site (email, chat, another website), their session cookie is sent with the request, and the XSS payload executes in the context of their authenticated admin session.\n\n## Proof of Concept\n\n1. Craft a URL with a payload that breaks out of the input value attribute:\n\n```\nhttps://your-avideo-instance.com/plugin/User_Location/testIP.php?ip=\">\n```\n\n2. URL-encoded version for embedding in links:\n\n```\nhttps://your-avideo-instance.com/plugin/User_Location/testIP.php?ip=%22%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E\n```\n\n3. The resulting HTML rendered in the browser:\n\n```html\n\">\n```\n\n4. To exploit via cross-origin link (leveraging SameSite=None), host the following on an attacker-controlled page:\n\n```html\n\n\n\n

Click here to check your IP geolocation:

\n\n Check IP Location\n\n\n\n```\n\n5. When an admin clicks the link, their session cookie is sent (due to `SameSite=None`), and the JavaScript executes in their authenticated session.\n\n## Impact\n\nAn attacker can execute arbitrary JavaScript in the context of an admin user's session by sending them a crafted link. Because AVideo uses `SameSite=None` for session cookies, the attack works from any external website. Successful exploitation allows the attacker to steal the admin session cookie, create new admin accounts, modify site configuration, upload malicious plugins, or perform any other admin action.\n\n- **CWE-79**: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)\n- **Severity**: Medium\n\n## Recommended Fix\n\nApply `htmlspecialchars()` when outputting the `$ip` variable at `plugin/User_Location/testIP.php:34`:\n\n```php\n// plugin/User_Location/testIP.php:34\n\">\n```\n\n---\n*Found by [aisafe.io](https://aisafe.io)*", "title": "github - https://api.github.com/advisories/GHSA-jqrj-chh6-8h78" }, { "category": "other", "text": "0.00029", "title": "EPSS" }, { "category": "other", "text": "3.8", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5893889" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34739" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34739.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-jqrj-chh6-8h78" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-jqrj-chh6-8h78" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34739" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/WWBN/AVideo/commit/31e6888e40be89cc2ab27d4cef449f6d8339ffb2" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-jqrj-chh6-8h78" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5893889" ] } ], "title": "CVE-2026-34739" } ] }