CVE-2022-27140: An arbitrary file upload vulnerability in the file upload module of express-fileupload 1.3.1 allows attackers

Q: How do I fix CVE-2022-27140?

express-fileupload: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-27140 being exploited?

CVE-2022-27140 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-27140 affect?

CVE-2022-27140 affects express-fileupload. Severity is critical (CVSS 9.8). An arbitrary file upload vulnerability in the file upload module of express-fileupload 1.3.1 allows attackers to execute arbitrary code via a crafted PHP file. NOTE: the vendor's position is that the observed behavior can only occur with "i

Q: How urgent is CVE-2022-27140?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-27140 is a critical-severity flaw (CVSS 9.8) affecting express-fileupload. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An arbitrary file upload vulnerability in the file upload module of express-fileupload 1.3.1 allows attackers to execute arbitrary code via a crafted PHP file. NOTE: the vendor's position is that the observed behavior can only occur with "intentional misusing of the API": the express-fileupload middleware is not responsible for an application's business logic (e.g., determining whether or how a file should be renamed).

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-434
Published	2022-04-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: express-fileupload project

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

Am I affected?

Timeline

2022-04-12 17:15 UTCPublished CVE record published
2026-06-17 04:36 UTCUpdated Record last modified

express-fileupload project express-fileupload DOWNGRADE

Affected: 1.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.1

1. Check installed version

npm ls express-fileupload

2. No fixed release: DOWNGRADE to a release before 1.3.1

npm view express-fileupload versions npm install express-fileupload@"<1.3.1"

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-2022-27140?

express-fileupload: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-27140 being exploited?

CVE-2022-27140 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-2022-27140 affect?

CVE-2022-27140 affects express-fileupload. Severity is critical (CVSS 9.8). An arbitrary file upload vulnerability in the file upload module of express-fileupload 1.3.1 allows attackers to execute arbitrary code via a crafted PHP file. NOTE: the vendor's position is that the observed behavior can only occur with "i

How urgent is CVE-2022-27140?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-27261 HIGH 7.5 DOWNGRADE An arbitrary file write vulnerability in Express-FileUpload v1.3.1 allows attackers to upload multiple files w
CVE-2020-7699 HIGH 7.5 UPGRADE MITIGATE This affects the package express-fileupload before 1.1.8

References

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