How severe is CVE-2026-33399?

CVE-2026-33399 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-33399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33399?

CVE-2026-33399 affects Wallosapp Wallos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33399?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33399 have an EU (EUVD) identifier?

Yes. CVE-2026-33399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14945.

When was CVE-2026-33399 published?

CVE-2026-33399 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-33399

CVE-2026-33399 is a high-severity vulnerability in Wallosapp Wallos with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14945
Weakness: CWE-918
Affected product: Wallosapp Wallos
Published: 2026-03-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33399?: 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.
How severe is CVE-2026-33399?: CVE-2026-33399 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-33399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33399?: CVE-2026-33399 affects Wallosapp Wallos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33399?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33399 have an EU (EUVD) identifier?: Yes. CVE-2026-33399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14945.
When was CVE-2026-33399 published?: CVE-2026-33399 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wallosapp:wallos:*:*:*:*:*:*:*:*

More vulnerabilities in Wallosapp Wallos

CVE-2024-55372 — Critical (CVSS 9.8): Wallos <=2.38.2 has a file upload vulnerability in the restore database function, which allows unauthenticated users to…
CVE-2024-55371 — Critical (CVSS 9.8): Wallos <= 2.38.2 has a file upload vulnerability in the restore backup function, which allows authenticated users to…
CVE-2026-33407 — Critical (CVSS 9.1): Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, Wallos…
CVE-2026-30840 — High (CVSS 8.8): Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.6.2, there is a server-side…
CVE-2024-29320 — High (CVSS 8.1): Wallos before 1.15.3 is vulnerable to SQL Injection via the category and payment parameters to /subscriptions/get.php.
CVE-2026-27479 — High (CVSS 7.7): Wallos is an open-source, self-hostable personal subscription tracker. Versions 4.6.0 and below contain a Server-Side…

All CVEs affecting Wallosapp Wallos →

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities

CVE-2026-47938 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9394 and earlier are affected by a Server-Side Request Forgery (SSRF)…
CVE-2026-35431 — Critical (CVSS 10.0): Server-side request forgery (ssrf) in Microsoft Entra ID Entitlement Management allows an unauthorized attacker to…
CVE-2026-32186 — Critical (CVSS 10.0): Server-side request forgery (ssrf) in Microsoft Bing allows an unauthorized attacker to elevate privileges over a…
CVE-2026-33107 — Critical (CVSS 10.0): Server-side request forgery (ssrf) in Azure Databricks allows an unauthorized attacker to elevate privileges over a…
CVE-2026-32871 — Critical (CVSS 10.0): FastMCP is a Pythonic way to build MCP servers and clients. Prior to version 3.2.0, the OpenAPIProvider in FastMCP…
CVE-2026-32169 — Critical (CVSS 10.0): Server-side request forgery (ssrf) in Azure Cloud Shell allows an unauthorized attacker to elevate privileges over a…

Browse all CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities →