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CVE-2026-33399

Wallosapp Wallos server-side request forgery (SSRF)

7.7 HIGHPublic exploitEPSS 0.40%
  1. Published24 Mar 2026

Description

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, the SSRF fix applied in version 4.6.2 for CVE-2026-30839 and CVE-2026-30840 is incomplete. The validate_webhook_url_for_ssrf() protection was added to the test* notification endpoints but not to the corresponding save* endpoints. An authenticated user can save an internal/private IP address as a notification URL, and when the cron job sendnotifications.php executes, the request is sent to the internal IP without any SSRF validation. This issue has been patched in version 4.7.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

Wallosapp Wallos< 4.7.0

Remediation

Fixed in
Wallosapp Wallos≥ 4.7.0

References

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Frequently asked

Is CVE-2026-33399 being actively exploited?

CVE-2026-33399 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-33399?

CVE-2026-33399 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-33399?

Affected products include Wallosapp Wallos.

How do I fix CVE-2026-33399?

Upgrade affected software to a fixed version, for example Wallosapp Wallos 4.7.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33399 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.