Is CVE-2025-34291 in the CISA KEV catalog?

Yes. CVE-2025-34291 is on the CISA Known Exploited Vulnerabilities list, added 2026-05-21.

What is the CVSS severity of CVE-2025-34291?

CVE-2025-34291 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2025-34291?

CVE-2025-34291 has an EPSS score of 78.89% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2025-34291?

No published fix for CVE-2025-34291 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-06-04. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2025-34291

HIGHCISA KEVEPSS 100th pctl

8.8

CVSS v3

NVD

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.

CWE-346

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-06-04

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

78.89%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-06-04

References

Exploit1

obsidiansecurity.com

Third-Party Advisory2

Government Resource1

cisa.gov

Product1

github.com

Related Vulnerabilities

Other CWE-346 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-1185	High	7.2	82%	-	Fix
CVE-2020-16952	High	8.6	71%	-	-
CVE-2023-29711	Critical	9.8	70%	-	-
CVE-2015-4495	High	8.8	70%	KEV	Fix
CVE-2024-23898	High	8.8	67%	-	Fix
CVE-2021-21135	Medium	6.5	19%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-14.