CVE-2026-40229: Helpy contains a stored cross-site scripting vulnerability in the post author display logic

Routine

MEDIUM 5.4DOWNGRADE

CVE-2026-40229 is a medium-severity flaw (CVSS 5.4) affecting helpy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Helpy contains a stored cross-site scripting vulnerability in the post author display logic. Any registered user can persist arbitrary HTML in their account name field and cause it to be rendered unescaped in public forum threads where they participate, in the admin ticket view, and in HTML notification emails sent to other users.This issue affects helpy: 2.8.0.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-29
Last modified	2026-10-26

Publisher (CNA): Fluid Attacks · Vendor: helpy.io

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 16:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

helpy.io helpy DOWNGRADE

Affected: 2.8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.8.0

1. Check installed version

apt-cache policy helpy || rpm -q helpy || helpy --version

2. No fixed release: DOWNGRADE to a release before 2.8.0 (Debian / Ubuntu)

apt-cache madison helpy sudo apt install helpy=<VERSION_BEFORE_2.8.0> sudo apt-mark hold helpy

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

dnf --showduplicates list helpy sudo dnf downgrade helpy-<VERSION_BEFORE_2.8.0> sudo dnf versionlock add helpy

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-2026-40229?

helpy: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-40229 being exploited?

CVE-2026-40229 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-2026-40229 affect?

CVE-2026-40229 affects helpy. Severity is medium (CVSS 5.4). Helpy contains a stored cross-site scripting vulnerability in the post author display logic. Any registered user can persist arbitrary HTML in their account name field and cause it to be rendered unescaped in public forum threads where they

How urgent is CVE-2026-40229?

Priority 26/100. Public exploit reference

Related CVEs

CVE-2026-40230 MEDIUM 5.4 DOWNGRADE Helpy contains a stored cross-site scripting vulnerability in the knowledge base Doc rendering logic

References

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