CVE-2026-4528Public exploitNetwork attack vector

Unauthenticated SSRF via URL validation bypass

Published Mar 21, 2026 · Updated Mar 21, 2026

Server-side request forgery in trueleaf Apiflow 0.9.7 allows remote attackers to send requests from the server via crafted URLs. The validateUrlSecurity function in packages/server/src/service/proxy/http_proxy.service.ts fails to stop an attacker-controlled destination from reaching the HTTP proxy path; the exact validation bypass is undisclosed. No authentication or user interaction is required, and the reachable destination and response handling bound the resulting data exposure or service effect.

CVSS severity7.3
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in trueleaf Apiflow 0.9.7 allows remote attackers to send requests from the server via crafted URLs. The validateUrlSecurity function in packages/server/src/service/proxy/http_proxy.service.ts fails to stop an attacker-controlled destination from reaching the HTTP proxy path; the exact validation bypass is undisclosed. No authentication or user interaction is required, and the reachable destination and response handling bound the resulting data exposure or service effect.

The record

CVE
CVE-2026-4528
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
trueleaf
Product
Apiflow
Classifications
CWE-918, CAPEC-664, T1090
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 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?

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

  1. Affected versionversion=0.9.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

trueleaf · Apiflowversion=0.9.7

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1090Proxy

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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