Server-Side Request Forgery Vulnerability in Appsmith by Appsmithorg
CVE-2026-5418

6.9MEDIUM

Key Information:

Vendor

Appsmithorg

Status
Appsmith
Vendor
CVE Published:
2 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5418?

A vulnerability was discovered in Appsmith, specifically within the computeDisallowedHosts function in the WebClientUtils.java file, affecting versions up to 1.97. This security flaw allows remote attackers to exploit server-side request forgery, potentially leading to unauthorized data access or manipulation. The vendor, Appsmithorg, promptly addressed the issue, releasing an updated version (1.99) to mitigate the risks. Users are strongly advised to upgrade to this version to ensure system integrity and security.

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Deploy the Patch

Affected Version(s)

appsmith 1.0

appsmith 1.1

appsmith 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5418 - Proof of Concept

References

https://vuldb.com/vuln/354855
vdb-entrytechnical-description
https://vuldb.com/vuln/354855/cti
signaturepermissions-required
https://vuldb.com/submit/780190
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Executio (VulDB User)
VulDB CNA Team
JSON
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