CVE-2026-51583Public exploitNetwork attack vector

Authenticated SSRF via incomplete reserved-address validation

Published Aug 11, 2026 · Updated Aug 11, 2026

SSRF in usememos Memos 0.30.0 and earlier allows remote authenticated users to reach internal services through a crafted webhook URL. The reservedCIDRs predicate in internal/webhook/validate.go omits 0.0.0.0/8 and other non-routable ranges, so validation accepts destinations the server routes internally. Any authenticated user who can register and trigger a webhook can make the server issue an HTTP POST from its trusted network position, exposing only services reachable from that host or container.

CVSS severity8.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in usememos Memos 0.30.0 and earlier allows remote authenticated users to reach internal services through a crafted webhook URL. The reservedCIDRs predicate in internal/webhook/validate.go omits 0.0.0.0/8 and other non-routable ranges, so validation accepts destinations the server routes internally. Any authenticated user who can register and trigger a webhook can make the server issue an HTTP POST from its trusted network position, exposing only services reachable from that host or container.

The record

CVE
CVE-2026-51583
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, CAPEC-664, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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