CVE-2025-34291
CriticalExploitedPublic exploitLangflow CORS misconfiguration enables Account Takeover and RCE
Published Dec 6, 2025 · Updated Oct 15, 2026 · Also known as GHSA-577h-p2hh-v4mv, PYSEC-2025-78, ROOT-APP-PYPI-CVE-2025-34291
Key Facts
Patch immediately- CVE-2025-34291 is a critical-severity vulnerability (CVSS 9.4 v4) affecting Langflow, rootio-langflow.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 23, 2026. Public exploit code is available.
- EPSS estimates a 93% probability of exploitation in the next 30 days.
- Fixed versions are available, including Langflow 1.6.9+aikido.1, Langflow 1.7.0, Langflow <=1.6.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/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
EPSS (30-day exploit likelihood)
93%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-34291 brief as a PDF
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Description
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 21, 2026 | Jun 4, 2026 | Not reported |
| Industry KEV feed | Jan 23, 2026 | Jun 4, 2026 | Not reported |
| CIRCL KEV | May 21, 2026 | Jun 4, 2026 | Not reported |
| ENISA EUVD | May 21, 2026 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| LangflowLangflow | See advisory | 1.6.9 |
| rootio-langflowroot | See advisory | 1.6.9+root.io.1 |
Patched Releases
Langflow
1.6.9+aikido.1, 1.7.0, <=1.6.9
rootio-langflow
1.6.9+root.io.1
Timeline
Publicly disclosed
Dec 6, 2025
Added to Industry KEV feed
Jan 23, 2026
Added to CISA KEV
May 21, 2026
Added to CIRCL KEV
May 21, 2026
Added to ENISA EUVD
May 21, 2026
Last updated
Oct 15, 2026
Weakness Type
- CWE-346 Origin Validation Error
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2025/34xxx/CVE-2025-34291.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-34291
- advisoryhttps://www.crowdsec.net/vulntracking-report/cve-2025-34291
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution.
Affected: Langflow; rootio-langflow. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 23, 2026.
Yes. It was added on May 21, 2026 with a federal remediation due date of Jun 4, 2026.
Public exploit code is available.
Fixed versions are available, including Langflow 1.6.9+aikido.1, Langflow 1.7.0, Langflow <=1.6.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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