CVE-2026-33953Public exploitNetwork attack vector

Authenticated SSRF via unresolved internal hostnames

Published Mar 27, 2026 · Updated Mar 27, 2026

SSRF in LinkAce before 2.5.3 allows remote authenticated users to access internal HTTP services through application-side requests. NoPrivateIpRule rejects private IP literals but does not resolve and validate hostnames before HtmlMeta and FetchController fetch their destinations. Any authenticated account that submits an internal hostname can make the server retrieve otherwise unreachable content, exposing internal endpoints and responses.

CVSS severity8.5
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SSRF in LinkAce before 2.5.3 allows remote authenticated users to access internal HTTP services through application-side requests. NoPrivateIpRule rejects private IP literals but does not resolve and validate hostnames before HtmlMeta and FetchController fetch their destinations. Any authenticated account that submits an internal hostname can make the server retrieve otherwise unreachable content, exposing internal endpoints and responses.

The record

CVE
CVE-2026-33953
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Kovah
Product
LinkAce
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kovah · LinkAceversion=< 2.5.3

Published CVSS scores

8.5GitHub, Inc.CVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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)
T1046Network Service Discovery

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo