CVE-2023-31237Network attack vector

Unauthenticated user redirection via unvalidated redirect_to

Published Dec 29, 2023 · Updated Apr 28, 2026

Open redirect in Dylan James Zephyr Project Manager 3.3.9 and earlier allows remote attackers to redirect users via crafted links. The plugin accepts a user-controlled redirect_to parameter without validating that its destination is trusted before issuing the redirect. No authentication is required, but a target must follow the crafted link; the redirect can send the target from a legitimate site to a phishing site.

CVSS severity4.7
Medium
EPSS probability0.36%
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

Open redirect in Dylan James Zephyr Project Manager 3.3.9 and earlier allows remote attackers to redirect users via crafted links. The plugin accepts a user-controlled redirect_to parameter without validating that its destination is trusted before issuing the redirect. No authentication is required, but a target must follow the crafted link; the redirect can send the target from a legitimate site to a phishing site.

The record

CVE
CVE-2023-31237
Published
Dec 29, 2023
Updated
Apr 28, 2026
Vendor
Dylan James
Product
Zephyr Project Manager
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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=n/a <=3.3.9 changes=[{"at":"3.3.91","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dylan James · Zephyr Project Managerversion=n/a <=3.3.9 changes=[{"at":"3.3.91","status":"unaffected"}]

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.7PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/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')
T1566.002Phishing: Spearphishing Link

Public exploit references

No public exploit references are available in this record.

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