CVE-2021-4260Network attack vector

User redirection via unchecked absolute URLs

Published Dec 19, 2022 · Updated Apr 15, 2025

Open redirect in Oils JS 7.8.6 allows remote attackers to send users to untrusted sites through application redirects. In core/Web.js, the framework's Express response.redirect method accepts absolute URLs without comparing their origins against an allowlist. Exploitation requires an application route to pass attacker-influenced input to that method and a user to follow the crafted link, enabling phishing or credential capture on an attacker-controlled site.

CVSS severity6.1
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Oils JS 7.8.6 allows remote attackers to send users to untrusted sites through application redirects. In core/Web.js, the framework's Express response.redirect method accepts absolute URLs without comparing their origins against an allowlist. Exploitation requires an application route to pass attacker-influenced input to that method and a user to follow the crafted link, enabling phishing or credential capture on an attacker-controlled site.

The record

CVE
CVE-2021-4260
Published
Dec 19, 2022
Updated
Apr 15, 2025
Vendor
Manny Vergel
Product
Oils JS
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Manny Vergel · Oils JSversion=n/a

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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