CVE-2026-33400: Wallos is an open-source, self-hostable personal subscription tracker

Q: How do I fix CVE-2026-33400?

wallos: upgrade to 4.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33400 being exploited?

CVE-2026-33400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33400 affect?

CVE-2026-33400 affects wallos. Severity is medium (CVSS 5.4). Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, a stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint allows any authenticated user to inject arbitrary JavaScr

Q: How urgent is CVE-2026-33400?

Priority 26/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2026-33400 is a medium-severity flaw (CVSS 5.4) affecting wallos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, a stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint allows any authenticated user to inject arbitrary JavaScript that executes when any user visits the Settings, Subscriptions, or Statistics pages. Combined with the wallos_login authentication cookie lacking the HttpOnly flag, this enables full session hijacking. This

Why this priority

Public exploit reference

A fixed release or distro patch exists.

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 90%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: wallosapp

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

Am I affected?

Timeline

2026-03-24 18:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

wallosapp wallos UPGRADE

Affected: < 4.7.0

Fixed in: 4.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wallos

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wallos

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-33400?

wallos: upgrade to 4.7.0. Exact commands for each OS are on this page.

Is CVE-2026-33400 being exploited?

CVE-2026-33400 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-2026-33400 affect?

CVE-2026-33400 affects wallos. Severity is medium (CVSS 5.4). Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, a stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint allows any authenticated user to inject arbitrary JavaScr

How urgent is CVE-2026-33400?

Priority 26/100. Public exploit reference

Related CVEs

CVE-2026-33417 MEDIUM 6.5 UPGRADE Wallos is an open-source, self-hostable personal subscription tracker
CVE-2026-33407 CRITICAL 9.1 UPGRADE Wallos is an open-source, self-hostable personal subscription tracker
CVE-2026-33401 MEDIUM 6.5 UPGRADE Wallos is an open-source, self-hostable personal subscription tracker
CVE-2026-33399 HIGH 7.7 UPGRADE Wallos is an open-source, self-hostable personal subscription tracker
CVE-2026-30842 MEDIUM 4.3 UPGRADE Wallos is an open-source, self-hostable personal subscription tracker

References

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