CVE-2026-33661

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Source
https://cve.org/CVERecord?id=CVE-2026-33661
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33661.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33661
Aliases
Published
2026-03-26T21:05:22.607Z
Modified
2026-04-10T05:43:18.252609Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
WeChat Pay callback signature verification bypassed when Host header is localhost
Details

Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the verify_wechat_sign() function in src/Functions.php unconditionally skips all signature verification when the PSR-7 request reports localhost as the host. An attacker can exploit this by sending a crafted HTTP request to the WeChat Pay callback endpoint with a Host: localhost header, bypassing the RSA signature check entirely. This allows forging fake WeChat Pay payment success notifications, potentially causing applications to mark orders as paid without actual payment. Version 3.7.20 fixes the issue.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33661.json",
    "cwe_ids": [
        "CWE-290"
    ]
}
References

Affected packages

Git / github.com/yansongda/pay

Affected ranges

Type
GIT
Repo
https://github.com/yansongda/pay
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
26987ebf789f1e7f0a85febb640986ab4289fd7f
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.7.20"
        }
    ]
}

Affected versions

v0.*
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.5.5
v0.6.0
v0.6.1
v0.6.2
v1.*
v1.0.0
v1.0.1
v1.1.1
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v2.*
v2.0.0
v2.0.0-beta
v2.0.1
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.14
v2.0.15
v2.0.16
v2.0.17
v2.0.18
v2.0.19
v2.0.2
v2.0.20
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v2.1.0
v2.1.0-beta
v2.1.0-beta.1
v2.1.0-beta.2
v2.1.1
v2.1.2
v2.10.0
v2.10.0-beta.0
v2.10.1
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.3.0
v2.3.1
v2.3.2
v2.4.0
v2.4.0-beta
v2.4.0-beta.3
v2.4.0-beta1
v2.4.0-beta2
v2.4.1
v2.4.2
v2.4.3
v2.4.4
v2.5.0
v2.5.0-beta
v2.5.1
v2.5.2
v2.5.3
v2.5.4
v2.5.5
v2.5.6
v2.5.7
v2.5.8
v2.5.9
v2.6.0
v2.6.0-beta
v2.6.0-beta.1
v2.6.0-beta.2
v2.6.0-beta.3
v2.6.1
v2.6.2
v2.7.0
v2.7.1
v2.7.2
v2.7.3
v2.7.4
v2.7.7
v2.7.8
v2.8.0-beta.0
v2.8.1
v2.8.2
v2.8.2-beta.0
v2.8.3
v2.8.4
v2.8.6
v2.9.0
v2.9.0-beta.0
v2.9.0-beta.1
v2.9.0-beta.2
v2.9.1
v2.9.2
v2.9.3
v2.9.4
v2.9.5
v3.*
v3.0.0
v3.0.0-alpha.3
v3.0.0-alpha.4
v3.0.0-beta.1
v3.0.0-beta.10
v3.0.0-beta.2
v3.0.0-beta.3
v3.0.0-beta.4
v3.0.0-beta.5
v3.0.0-beta.6
v3.0.0-beta.7
v3.0.0-beta.8
v3.0.0-beta.9
v3.0.0-rc.0
v3.0.0-rc.1
v3.0.0-rc.2
v3.0.1
v3.0.10
v3.0.11
v3.0.12
v3.0.13
v3.0.14
v3.0.15
v3.0.16
v3.0.17
v3.0.18
v3.0.19
v3.0.2
v3.0.20
v3.0.21
v3.0.22
v3.0.23
v3.0.24
v3.0.25
v3.0.26
v3.0.27
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.0.7
v3.0.8
v3.0.9
v3.1.0
v3.1.0-beta.0
v3.1.0-beta.1
v3.1.0-rc.0
v3.1.1
v3.1.10
v3.1.11
v3.1.12
v3.1.2
v3.1.3
v3.1.4
v3.1.5
v3.1.6
v3.1.7
v3.1.8
v3.1.9
v3.2.0
v3.2.1
v3.2.10
v3.2.11
v3.2.12
v3.2.13
v3.2.14
v3.2.2
v3.2.3
v3.2.4
v3.2.5
v3.2.6
v3.2.7
v3.2.8
v3.2.9
v3.3.0
v3.3.0-alpha.0
v3.3.0-alpha.1
v3.3.0-alpha.2
v3.3.0-alpha.3
v3.3.0-beta.0
v3.3.0-beta.1
v3.3.0-beta.2
v3.3.0-beta.3
v3.3.1
v3.4.0
v3.4.1
v3.4.2
v3.5.0
v3.5.1
v3.5.2
v3.5.3
v3.6.0
v3.6.0-beta.0
v3.6.0-beta.1
v3.6.1
v3.6.2
v3.6.3
v3.6.4
v3.6.5
v3.7.0
v3.7.1
v3.7.10
v3.7.11
v3.7.12
v3.7.13
v3.7.14
v3.7.15
v3.7.16
v3.7.17
v3.7.18
v3.7.19
v3.7.2
v3.7.3
v3.7.4
v3.7.5
v3.7.6
v3.7.7
v3.7.8
v3.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33661.json"