CVE-2025-34291
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
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EPSS — probability of exploitation (30 days)
83.6%
99.7th percentile
CISA KEV
Listed
Added 2026-05-21 · patch by 2026-06-04
Weakness / dates
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Published — · modified —
Timeline
- 2026-05-21 — Added to CISA KEV (actively exploited)
- 2026-06-04 — CISA patch-by deadline
Description
Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.