CVE-2022-27261: An arbitrary file write vulnerability in Express-FileUpload v1.3.1 allows attackers to upload multiple files w

Q: How do I fix CVE-2022-27261?

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

Q: Is CVE-2022-27261 being exploited?

CVE-2022-27261 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-2022-27261 affect?

CVE-2022-27261 affects express-fileupload. Severity is high (CVSS 7.5). An arbitrary file write vulnerability in Express-FileUpload v1.3.1 allows attackers to upload multiple files with the same name, causing an overwrite of files in the web application server.

Q: How urgent is CVE-2022-27261?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2022-27261 is a high-severity flaw (CVSS 7.5) affecting express-fileupload. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An arbitrary file write vulnerability in Express-FileUpload v1.3.1 allows attackers to upload multiple files with the same name, causing an overwrite of files in the web application server.

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
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-2022-27261?

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

Is CVE-2022-27261 being exploited?

CVE-2022-27261 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-2022-27261 affect?

CVE-2022-27261 affects express-fileupload. Severity is high (CVSS 7.5). An arbitrary file write vulnerability in Express-FileUpload v1.3.1 allows attackers to upload multiple files with the same name, causing an overwrite of files in the web application server.

How urgent is CVE-2022-27261?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-27140 CRITICAL 9.8 DOWNGRADE An arbitrary file upload vulnerability in the file upload module of express-fileupload 1.3.1 allows attackers

References

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