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CVE-2025-40923— Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely

Quick assessment

Affected
MIYAGAWA Plack::Middleware::Session
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Plack::Middleware::Session是plack开源的一个Plack的极简会话库。 Plack::Middleware::Session 0.35之前版本存在安全漏洞，该漏洞源于会话ID生成不安全。

AI Predicted 7.5 Difficulty: Easy EPSS 0.36% · P28
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I. Basic Information for CVE-2025-40923

Vulnerability Information
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Vulnerability Title
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely
Source: CVE Program / CVE List V5
Vulnerability Description
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
可预测问题
Source: CVE Program / CVE List V5
Vulnerability Title
Plack::Middleware::Session 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plack::Middleware::Session是plack开源的一个Plack的极简会话库。 Plack::Middleware::Session 0.35之前版本存在安全漏洞，该漏洞源于会话ID生成不安全。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MIYAGAWA Plack::Middleware::Session 0.01 ~ 0.35 -

II. Public POCs for CVE-2025-40923

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III. Intelligence Information for CVE-2025-40923

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Vendor Advisories for CVE-2025-40923 (1)

IV. Related Vulnerabilities

Same product: Plack::Middleware::Session
Same vendor: MIYAGAWA
Same weakness: CWE-340

V. Comments for CVE-2025-40923

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