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  4. CVE 2025 34291 langflow 169 cors misconfiguration to token
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Back to active CVEs
Critical · CVSS 9.4Known ExploitedCVE-2025-34291

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCECVE-2025-34291

Answer in brief

CVE-2025-34291 records a Critical severity (CVSS 9.4) vulnerability in Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE. The current sources mark it as known exploited. The current feed maps Langflow/Langflow (generic), Langflow/Langflow (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Dec 5, 2025Updated Oct 15, 2026Source checked Nov 3, 2026First seen by HOL May 24, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.4. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Langflow/Langflow (generic), Langflow/Langflow (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Langflow/Langflowgeneric>=0 <=1.6.9Not reported
Langflow/Langflowgeneric0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Langflow/Langflow, Langflow/Langflow.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Dec 5, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    May 21, 2026

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • GitHub security advisorygithub.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
  • Source referencecrowdsec.net
  • Source referenceobsidiansecurity.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Nov 3, 2026
References
5 linked sources
Open source record