SNS signature bypass via attacker-controlled certificate URL
Published May 28, 2026 · Updated May 28, 2026
Improper certificate validation in ExAws.SNS 2.0.1 through 2.3.4 allows remote attackers to forge accepted SNS messages. The verify_message/1 path passes an unvalidated SigningCertURL to PublicKeyCache.get/1, which fetches and caches any supplied certificate before checking the message signature against it. Exploitation requires an HTTP endpoint that passes incoming request bodies to verify_message/1; accepted forgeries can inject notifications or alter SNS subscriptions.
Summary
What happened
Improper certificate validation in ExAws.SNS 2.0.1 through 2.3.4 allows remote attackers to forge accepted SNS messages. The verify_message/1 path passes an unvalidated SigningCertURL to PublicKeyCache.get/1, which fetches and caches any supplied certificate before checking the message signature against it. Exploitation requires an HTTP endpoint that passes incoming request bodies to verify_message/1; accepted forgeries can inject notifications or alter SNS subscriptions.
The record
- CVE
- CVE-2026-47074
- Published
- May 28, 2026
- Updated
- May 28, 2026
- Vendor
- ExAws
- Product
- ExAws.SNS
- Classifications
- CWE-295, CAPEC-473, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 28, 2026CVE publishedPublication date reported by the CVE source.
- May 28, 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.
- Affected versionversion=2.0.1 <2.3.5
- Affected versionversion=a7ec21880943f4dac1d59bda557db0ffcd2b61fa <1853d280b152d10384a1e21a22cf22152a60be48
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
- GHSA-8jgf-23q5-x7xx proof of conceptproof of concept · demonstrated
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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