CVE-2026-3346: IBM Langflow Desktop 1.6.0 through 1.8.4 Lanflow is vulnerable to stored cross-site scripting

Routine

MEDIUM 6.4UPGRADE

CVE-2026-3346 is a medium-severity flaw (CVSS 6.4) affecting langflow desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Langflow Desktop 1.6.0 through 1.8.4 Lanflow is vulnerable to stored cross-site scripting. This vulnerability allows an authenticated user to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-04-30
Last modified	2026-10-26

Publisher (CNA): IBM Corporation · Vendor: langflow

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-30 21:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

langflow langflow desktop UPGRADE

Affected: >= 1.6.0 and <= 1.8.4

Fixed in: newer than 1.8.4

Safe to downgrade to: a release before 1.6.0

1. Check installed version

apt-cache policy langflow-desktop || rpm -q langflow-desktop || langflow-desktop --version

2. UPGRADE to newer than 1.8.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade langflow-desktop

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade langflow-desktop

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.6.0 (Debian / Ubuntu)

apt-cache madison langflow-desktop sudo apt install langflow-desktop=<VERSION_BEFORE_1.6.0> sudo apt-mark hold langflow-desktop

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list langflow-desktop sudo dnf downgrade langflow-desktop-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add langflow-desktop

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-3346?

langflow desktop: upgrade to newer than 1.8.4. Exact commands for each OS are on this page.

Is CVE-2026-3346 being exploited?

CVE-2026-3346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-3346 affect?

CVE-2026-3346 affects langflow desktop. Severity is medium (CVSS 6.4). IBM Langflow Desktop 1.6.0 through 1.8.4 Lanflow is vulnerable to stored cross-site scripting. This vulnerability allows an authenticated user to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potenti

How urgent is CVE-2026-3346?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2026-6543 HIGH 8.8 UPGRADE IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow allows an attacker to execute arbitrary commands with the pr
CVE-2026-3340 MEDIUM 6.5 UPGRADE IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF)
CVE-2026-4503 HIGH 7.5 UPGRADE IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow could allow an unauthenticated user to view other users' ima
CVE-2026-3345 MEDIUM 6.5 UPGRADE IBM Langflow Desktop <=1.8.4 Langflow could allow a remote attacker to traverse directories on the system
CVE-2026-4502 MEDIUM 6.5 UPGRADE IBM Langflow Desktop 1.2.0 through 1.8.4 Langflow could allow an authenticated attacker to traverse directorie

References

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