CVE-2026-33340: LoLLMs WEBUI provides the Web user interface for Lord of Large Language and Multi modal Systems

This week

CRITICAL 9.1REMOTEMITIGATE

CVE-2026-33340 is a critical-severity flaw (CVSS 9.1) affecting lollms web ui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LoLLMs WEBUI provides the Web user interface for Lord of Large Language and Multi modal Systems. A critical Server-Side Request Forgery (SSRF) vulnerability has been identified in all known existing versions of `lollms-webui`. The `@router.post("/api/proxy")` endpoint allows unauthenticated attackers to force the server into making arbitrary GET requests. This can be exploited to access internal services, scan local networks, or exfiltrate sensit

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	21.6% (top 2%)
CISA exploited list	No
Weakness	CWE-306, CWE-918
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lollms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 17:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

lollms lollms web ui MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lollms-web-ui || rpm -q lollms-web-ui || lollms-web-ui --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · perl-Encode · FIXED · 3.25-528.eln159 · FEDORA-2026-79991d0238 · source

sudo dnf upgrade --advisory=FEDORA-2026-79991d0238

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: regaan/CVE-2026-33340 (0 stars)
Write-up: github.com/ParisNeo/lollms-webui/security/advisories/GHSA-mcwr-5469-pxj4
Nuclei scan template: LoLLMs WEBUI - Server-Side Request Forgery

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-2026-33340?

lollms web ui: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-33340 being exploited?

CVE-2026-33340 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-2026-33340 affect?

CVE-2026-33340 affects lollms web ui. Severity is critical (CVSS 9.1). LoLLMs WEBUI provides the Web user interface for Lord of Large Language and Multi modal Systems. A critical Server-Side Request Forgery (SSRF) vulnerability has been identified in all known existing versions of `lollms-webui`. The `@router.

How urgent is CVE-2026-33340?

Priority 69/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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