Internal service access via exact-match host blocklist
Published Apr 2, 2026 · Updated Apr 2, 2026
SSRF in Appsmith through 1.97 allows remote authenticated users to reach internal services through dashboard API requests. WebClientUtils compares normalized hosts and resolved addresses only against an exact-match static blocklist, without rejecting private CIDR ranges. Exploitation requires permission to create or run an API request; successful requests can read or modify reachable internal services under the server network identity.
Summary
What happened
SSRF in Appsmith through 1.97 allows remote authenticated users to reach internal services through dashboard API requests. WebClientUtils compares normalized hosts and resolved addresses only against an exact-match static blocklist, without rejecting private CIDR ranges. Exploitation requires permission to create or run an API request; successful requests can read or modify reachable internal services under the server network identity.
The record
- CVE
- CVE-2026-5418
- Published
- Apr 2, 2026
- Updated
- Apr 2, 2026
- Vendor
- Appsmith
- Product
- Appsmith
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 2, 2026CVE publishedPublication date reported by the CVE source.
- Apr 2, 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.
- Affected versionversion=1.0
- Affected versionversion=1.1
- Affected versionversion=1.10
- Affected versionversion=1.11
- Affected versionversion=1.12
- Affected versionversion=1.13
- Affected versionversion=1.14
- Affected versionversion=1.15
- Affected versionversion=1.16
- Affected versionversion=1.17
- Affected versionversion=1.18
- Affected versionversion=1.19
- Affected versionversion=1.2
- Affected versionversion=1.20
- Affected versionversion=1.21
- Affected versionversion=1.22
- Affected versionversion=1.23
- Affected versionversion=1.24
- Affected versionversion=1.25
- Affected versionversion=1.26
- Affected versionversion=1.27
- Affected versionversion=1.28
- Affected versionversion=1.29
- Affected versionversion=1.3
- Affected versionversion=1.30
- Affected versionversion=1.31
- Affected versionversion=1.32
- Affected versionversion=1.33
- Affected versionversion=1.34
- Affected versionversion=1.35
- Affected versionversion=1.36
- Affected versionversion=1.37
- Affected versionversion=1.38
- Affected versionversion=1.39
- Affected versionversion=1.4
- Affected versionversion=1.40
- Affected versionversion=1.41
- Affected versionversion=1.42
- Affected versionversion=1.43
- Affected versionversion=1.44
- Affected versionversion=1.45
- Affected versionversion=1.46
- Affected versionversion=1.47
- Affected versionversion=1.48
- Affected versionversion=1.49
- Affected versionversion=1.5
- Affected versionversion=1.50
- Affected versionversion=1.51
- Affected versionversion=1.52
- Affected versionversion=1.53
- Affected versionversion=1.54
- Affected versionversion=1.55
- Affected versionversion=1.56
- Affected versionversion=1.57
- Affected versionversion=1.58
- Affected versionversion=1.59
- Affected versionversion=1.6
- Affected versionversion=1.60
- Affected versionversion=1.61
- Affected versionversion=1.62
- Affected versionversion=1.63
- Affected versionversion=1.64
- Affected versionversion=1.65
- Affected versionversion=1.66
- Affected versionversion=1.67
- Affected versionversion=1.68
- Affected versionversion=1.69
- Affected versionversion=1.7
- Affected versionversion=1.70
- Affected versionversion=1.71
- Affected versionversion=1.72
- Affected versionversion=1.73
- Affected versionversion=1.74
- Affected versionversion=1.75
- Affected versionversion=1.76
- Affected versionversion=1.77
- Affected versionversion=1.78
- Affected versionversion=1.79
- Affected versionversion=1.8
- Affected versionversion=1.80
- Affected versionversion=1.81
- Affected versionversion=1.82
- Affected versionversion=1.83
- Affected versionversion=1.84
- Affected versionversion=1.85
- Affected versionversion=1.86
- Affected versionversion=1.87
- Affected versionversion=1.88
- Affected versionversion=1.89
- Affected versionversion=1.9
- Affected versionversion=1.90
- Affected versionversion=1.91
- Affected versionversion=1.92
- Affected versionversion=1.93
- Affected versionversion=1.94
- Affected versionversion=1.95
- Affected versionversion=1.96
- Affected versionversion=1.97
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Appsmith internal HTTP listener proof of conceptproof of concept · demonstrated
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
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