{
"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-2026-33336",
"tracking": {
"current_release_date": "2026-03-29T00:39:49.719941Z",
"generator": {
"date": "2026-02-17T15:00:00Z",
"engine": {
"name": "V.E.L.M.A",
"version": "1.7"
}
},
"id": "CVE-2026-33336",
"initial_release_date": "2026-03-24T20:51:36.685565Z",
"revision_history": [
{
"date": "2026-03-24T20:51:36.685565Z",
"number": "1",
"summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
},
{
"date": "2026-03-24T20:51:40.130675Z",
"number": "2",
"summary": "NCSC Score created."
},
{
"date": "2026-03-24T20:56:16.293250Z",
"number": "3",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (2).| CWES updated (1).| Unknown change."
},
{
"date": "2026-03-24T20:57:30.647530Z",
"number": "4",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-26T00:50:31.464146Z",
"number": "5",
"summary": "Source connected.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-03-26T00:50:41.636459Z",
"number": "6",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-27T19:47:10.864626Z",
"number": "7",
"summary": "CVSS created.| Products connected (1).| Product Identifiers created (1).| Exploits created (1)."
},
{
"date": "2026-03-27T19:47:12.928495Z",
"number": "8",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-28T09:28:29.770440Z",
"number": "9",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-29T00:39:47.128932Z",
"number": "10",
"summary": "EPSS updated."
}
],
"status": "interim",
"version": "10"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/>=0.21.0|<2.2.0",
"product": {
"name": "vers:unknown/>=0.21.0|<2.2.0",
"product_id": "CSAFPID-5902473"
}
}
],
"category": "product_name",
"name": "vikunja"
}
],
"category": "vendor",
"name": "go-vikunja"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/>=0.21.0|<2.2.2",
"product": {
"name": "vers:unknown/>=0.21.0|<2.2.2",
"product_id": "CSAFPID-5943813",
"product_identification_helper": {
"cpe": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "vikunja"
}
],
"category": "vendor",
"name": "vikunja"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-33336",
"cwe": {
"id": "CWE-94",
"name": "Improper Control of Generation of Code ('Code Injection')"
},
"notes": [
{
"category": "description",
"text": "Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper enables `nodeIntegration` in the main BrowserWindow and does not restrict same-window navigations. An attacker who can place a link in user-generated content (task descriptions, comments, project descriptions) can cause the BrowserWindow to navigate to an attacker-controlled origin, where JavaScript executes with full Node.js access, resulting in arbitrary code execution on the victim's machine. Version 2.2.0 patches the issue.\n\n## Root cause\n\nTwo misconfigurations combine to create this vulnerability:\n\n1. **`nodeIntegration: true`** is set in `BrowserWindow` web preferences (`desktop/main.js:14-16`), giving any page loaded in the renderer full access to Node.js APIs (`require`, `child_process`, `fs`, etc.).\n\n2. **No `will-navigate` or `will-redirect` handler** is registered on the `webContents`. The existing `setWindowOpenHandler` (`desktop/main.js:19-23`) only intercepts `window.open()` calls (new-window requests). It does **not** intercept same-window navigations triggered by:\n - `` links (without `target=\"_blank\"`)\n - `window.location` assignments\n - HTTP redirects\n - `` tags\n\n## Attack scenario\n\n1. The attacker is a normal user on the same Vikunja instance (e.g., a member of a shared project).\n2. The attacker creates or edits a project description or task description containing a standard HTML link, e.g.: `Click here for the updated design spec`\n3. The Vikunja frontend renders this link. DOMPurify sanitization correctly allows it -- it is a legitimate anchor tag, not a script injection. Render path example: `frontend/src/views/project/ProjectInfo.vue` uses `v-html` with DOMPurify-sanitized output.\n4. The victim uses Vikunja Desktop and clicks the link.\n5. Because no `will-navigate` handler exists, the BrowserWindow navigates to `https://evil.example/exploit` in the same renderer process.\n6. The attacker's page now executes in a context with `nodeIntegration: true` and runs: `require('child_process').exec('id > /tmp/pwned');`\n7. Arbitrary commands execute as the victim's OS user.\n\n## Impact\n\nFull remote code execution on the victim's desktop. The attacker can read/write arbitrary files, execute arbitrary commands, install malware or backdoors, and exfiltrate credentials and sensitive data. No XSS vulnerability is required -- a normal, sanitizer-approved hyperlink is sufficient.\n\n## Proof of concept\n\n1. Set up a Vikunja instance with two users sharing a project.\n2. As the attacker user, edit a project description to include: `Meeting notes`\n3. Host poc.html with: ``\n4. As the victim, open the project in Vikunja Desktop and click the link.\n5. calc.exe (or any other command) executes on the victim's machine.\n\n## Credits\n\nThis vulnerability was found using [GitHub Security Lab Taskflows](https://github.com/GitHubSecurityLab/seclab-taskflows).",
"title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33336"
},
{
"category": "description",
"text": "Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper enables `nodeIntegration` in the main BrowserWindow and does not restrict same-window navigations. An attacker who can place a link in user-generated content (task descriptions, comments, project descriptions) can cause the BrowserWindow to navigate to an attacker-controlled origin, where JavaScript executes with full Node.js access, resulting in arbitrary code execution on the victim's machine. Version 2.2.0 patches the issue.\n\n## Root cause\n\nTwo misconfigurations combine to create this vulnerability:\n\n1. **`nodeIntegration: true`** is set in `BrowserWindow` web preferences (`desktop/main.js:14-16`), giving any page loaded in the renderer full access to Node.js APIs (`require`, `child_process`, `fs`, etc.).\n\n2. **No `will-navigate` or `will-redirect` handler** is registered on the `webContents`. The existing `setWindowOpenHandler` (`desktop/main.js:19-23`) only intercepts `window.open()` calls (new-window requests). It does **not** intercept same-window navigations triggered by:\n - `` links (without `target=\"_blank\"`)\n - `window.location` assignments\n - HTTP redirects\n - `` tags\n\n## Attack scenario\n\n1. The attacker is a normal user on the same Vikunja instance (e.g., a member of a shared project).\n2. The attacker creates or edits a project description or task description containing a standard HTML link, e.g.: `Click here for the updated design spec`\n3. The Vikunja frontend renders this link. DOMPurify sanitization correctly allows it -- it is a legitimate anchor tag, not a script injection. Render path example: `frontend/src/views/project/ProjectInfo.vue` uses `v-html` with DOMPurify-sanitized output.\n4. The victim uses Vikunja Desktop and clicks the link.\n5. Because no `will-navigate` handler exists, the BrowserWindow navigates to `https://evil.example/exploit` in the same renderer process.\n6. The attacker's page now executes in a context with `nodeIntegration: true` and runs: `require('child_process').exec('id > /tmp/pwned');`\n7. Arbitrary commands execute as the victim's OS user.\n\n## Impact\n\nFull remote code execution on the victim's desktop. The attacker can read/write arbitrary files, execute arbitrary commands, install malware or backdoors, and exfiltrate credentials and sensitive data. No XSS vulnerability is required -- a normal, sanitizer-approved hyperlink is sufficient.\n\n## Proof of concept\n\n1. Set up a Vikunja instance with two users sharing a project.\n2. As the attacker user, edit a project description to include: `Meeting notes`\n3. Host poc.html with: ``\n4. As the victim, open the project in Vikunja Desktop and click the link.\n5. calc.exe (or any other command) executes on the victim's machine.\n\n## Credits\n\nThis vulnerability was found using [GitHub Security Lab Taskflows](https://github.com/GitHubSecurityLab/seclab-taskflows).",
"title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33336.json"
},
{
"category": "other",
"text": "0.00249",
"title": "EPSS"
},
{
"category": "other",
"text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/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",
"title": "CVSSV4"
},
{
"category": "other",
"text": "6.5",
"title": "CVSSV4 base score"
},
{
"category": "other",
"text": "4.0",
"title": "NCSC Score"
},
{
"category": "other",
"text": "Exploit code publicly available, There is exploit data available from source Nvd",
"title": "NCSC Score top decreasing factors"
}
],
"product_status": {
"known_affected": [
"CSAFPID-5902473",
"CSAFPID-5943813"
]
},
"references": [
{
"category": "external",
"summary": "Source - nvd",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33336"
},
{
"category": "external",
"summary": "Source - cveprojectv5",
"url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33336.json"
},
{
"category": "external",
"summary": "Source - first",
"url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; nvd",
"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-83w9-9jf6-88vf"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; nvd",
"url": "https://vikunja.io/changelog/vikunja-v2.2.0-was-released"
}
],
"scores": [
{
"cvss_v3": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH"
},
"products": [
"CSAFPID-5902473",
"CSAFPID-5943813"
]
}
],
"title": "CVE-2026-33336"
}
]
}