CVE-2025-15578Network attack vector

Session hijacking via predictable session identifiers

Published Feb 16, 2026 · Updated Feb 16, 2026

Weak session ID generation in Maypole 2.10 through 2.13 allows remote attackers to hijack authenticated sessions via predicted identifiers. Maypole::Session seeds Perl's rand() with the system time and process ID, producing identifiers from attacker-estimable inputs rather than cryptographic entropy. Exploitation requires observing the server time and predicting the remaining generator state; a successful guess impersonates the authenticated session bound to that identifier.

CVSS severity9.8
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak session ID generation in Maypole 2.10 through 2.13 allows remote attackers to hijack authenticated sessions via predicted identifiers. Maypole::Session seeds Perl's rand() with the system time and process ID, producing identifiers from attacker-estimable inputs rather than cryptographic entropy. Exploitation requires observing the server time and predicting the remaining generator state; a successful guess impersonates the authenticated session bound to that identifier.

The record

CVE
CVE-2025-15578
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Aaron James Trevena
Product
Maypole
Classifications
CWE-338, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 16, 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.

  1. Affected versionversion=2.10 <=2.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Aaron James Trevena · Maypoleversion=2.10 <=2.13

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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