CVE-2026-2153Public exploitNetwork attack vector

Open redirect via redundant leading slashes

Published Feb 8, 2026 · Updated Feb 8, 2026

Open redirect in Doorman 0.1 through 0.6 allows remote attackers to send users to an external site via a crafted next parameter. The is_safe_url function accepts multiply slash-prefixed input because urljoin retains the application host, while browsers reinterpret the Location header as protocol-relative. Abuse requires a user to follow a crafted login link and complete or already have authentication, after which the browser leaves the trusted Doorman origin.

CVSS severity6.1
Medium
EPSS probability0.29%
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 Doorman 0.1 through 0.6 allows remote attackers to send users to an external site via a crafted next parameter. The is_safe_url function accepts multiply slash-prefixed input because urljoin retains the application host, while browsers reinterpret the Location header as protocol-relative. Abuse requires a user to follow a crafted login link and complete or already have authentication, after which the browser leaves the trusted Doorman origin.

The record

CVE
CVE-2026-2153
Published
Feb 8, 2026
Updated
Feb 8, 2026
Vendor
Marcin Wielgoszewski
Product
Doorman
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1
  2. Affected versionversion=0.2
  3. Affected versionversion=0.3
  4. Affected versionversion=0.4
  5. Affected versionversion=0.5
  6. Affected versionversion=0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marcin Wielgoszewski · Doormanversion=0.1; version=0.2; version=0.3; version=0.4; version=0.5; version=0.6

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
6.1NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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