CVE-2024-26470: A host header injection vulnerability in the forgot password function of FullStackHero's WebAPI Boilerplate v1

This week

HIGH 8.1REMOTEDOWNGRADE

CVE-2024-26470 is a high-severity flaw (CVSS 8.1) affecting .net 9 starter kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A host header injection vulnerability in the forgot password function of FullStackHero's WebAPI Boilerplate v1.0.0 and v1.0.1 allows attackers to leak the password reset token via a crafted request.

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	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-200
Published	2024-02-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fullstackhero

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-29 01:44 UTCPublished CVE record published
2026-06-17 07:17 UTCUpdated Record last modified

fullstackhero .net 9 starter kit DOWNGRADE

Affected: 1.0.0 · 1.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy .net-9-starter-kit || rpm -q .net-9-starter-kit || .net-9-starter-kit --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison .net-9-starter-kit sudo apt install .net-9-starter-kit=<VERSION_BEFORE_1.0.0> sudo apt-mark hold .net-9-starter-kit

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net-9-starter-kit sudo dnf downgrade .net-9-starter-kit-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add .net-9-starter-kit

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-2024-26470?

.net 9 starter kit: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-26470 being exploited?

CVE-2024-26470 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-2024-26470 affect?

CVE-2024-26470 affects .net 9 starter kit. Severity is high (CVSS 8.1). A host header injection vulnerability in the forgot password function of FullStackHero's WebAPI Boilerplate v1.0.0 and v1.0.1 allows attackers to leak the password reset token via a crafted request.

How urgent is CVE-2024-26470?

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

References

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