CVE-2023-28628Public exploitNetwork attack vector

Host restriction bypass via backslash authority parsing

Published Mar 27, 2023 · Updated Feb 19, 2025

Authority parsing in Lambda Island URI before 1.14.120 allows attackers to bypass host restrictions with a crafted URL. The URI parser's uri-regex accepts a backslash inside the authority, so authority-regex treats the following text as the host rather than a path. Impact requires a consuming application to trust the parsed host for a security decision; the parser alone does not redirect traffic or expose data.

CVSS severity6.1
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authority parsing in Lambda Island URI before 1.14.120 allows attackers to bypass host restrictions with a crafted URL. The URI parser's uri-regex accepts a backslash inside the authority, so authority-regex treats the following text as the host rather than a path. Impact requires a consuming application to trust the parsed host for a security decision; the parser alone does not redirect traffic or expose data.

The record

CVE
CVE-2023-28628
Published
Mar 27, 2023
Updated
Feb 19, 2025
Vendor
Lambda Island
Product
URI
Classifications
CWE-601, CWE-706
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.14.120

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Lambda Island · URIversion=< 1.14.120

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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')
CWE-706Use of Incorrectly-Resolved Name or Reference

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo