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CVE-2026-77352· NVD / CVE Program· CNA GitHub_M

Wallos: Authenticated SSRF via per-user SMTP notification host (low-privilege user)

Wallos is an open-source, self-hostable personal subscription tracker. From version 2.0.0 to before version 5.0.0, any authenticated Wallos user (no admin rights required) can make the server open arbitrary outbound SMTP connections to internal/link-local addresses, by setting the SMTP host of their personal email notifications to an internal IP. The per-user notification settings endpoint (endpoints/notifications/saveemailnotifications.php) performs no SSRF validation, and the notification cron (endpoints/cronjobs/sendnotifications.php) feeds that user-controlled host straight into PHPMailer ($mail->Host = $email['smtpAddress']). When the user's subscription notification fires, the server connects to the chosen host:port. This issue has been patched in version 5.0.0.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Aug 31, 2026
Updated
Sep 8, 2026
EPSS
0.3% · 24th percentile
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Report tools

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Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
4.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • ellite Wallos

    • >= 2.0.0, < 5.0.0affected

Same product

ellite: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-61640Wallos: SSRF via OIDC Token/UserInfo URL Configuration
    34Monitor
  • CVE-2026-61639Wallos: Zip Slip path traversal in database restore writes files to webroot
    34Monitor
  • CVE-2026-77348Wallos incomplete fix for CVE-2026-33407: unauthenticated httpoxy SSRF still reachable via `endpoints/payments/search.php`
    32Monitor
  • CVE-2026-61641Wallos: OIDC account takeover via email-based account linking without `email_verified` check
    32Monitor
  • CVE-2026-61638Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port
    32Monitor
  • CVE-2026-54600Wallos: Unauthenticated database replacement via import endpoint on fresh install
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
ellite Wallos5.0.0 · descriptionVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-616400 days apartWallos: SSRF via OIDC Token/UserInfo URL Configuration
    34Monitor
  • CVE-2026-616380 days apartWallos: SSRF via Test Email Notification - unvalidated SMTP host/port
    32Monitor
  • CVE-2026-41688116 days apartIncomplete fix for CVE-2026-33399: SSRF in Wallos
    30Monitor
  • CVE-2026-41687116 days apartWallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not Used in Inline Checks
    17Monitor
  • CVE-2026-773510 days apartWallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings
    14Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-546000 days apartWallos: Unauthenticated database replacement via import endpoint on fresh install
    32Monitor
  • CVE-2026-616410 days apartWallos: OIDC account takeover via email-based account linking without `email_verified` check
    32Monitor
  • CVE-2026-545980 days apartMissing Authentication for Critical Function in wallos
    30Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-918 · Server-Side Request Forgery (SSRF)

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records