CVE-2025-12585Public exploitNetwork attack vector

Unauthenticated conversation disclosure via exposed session identifiers

Published Dec 3, 2025 · Updated Apr 22, 2026

Sensitive information exposure in MxChat 2.5.5 and earlier allows remote attackers to obtain session IDs from uploaded filenames. The mxchat_fetch_conversation_history AJAX handler reads options keyed only by a client-supplied session ID without verifying session ownership. A visitor-accessible nonce and a disclosed or guessed session ID are sufficient to read conversation messages, metadata, and stored IP addresses.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in MxChat 2.5.5 and earlier allows remote attackers to obtain session IDs from uploaded filenames. The mxchat_fetch_conversation_history AJAX handler reads options keyed only by a client-supplied session ID without verifying session ownership. A visitor-accessible nonce and a disclosed or guessed session ID are sufficient to read conversation messages, metadata, and stored IP addresses.

The record

CVE
CVE-2025-12585
Published
Dec 3, 2025
Updated
Apr 22, 2026
Vendor
MxChat
Product
MxChat
Classifications
CWE-200, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=0 <=2.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MxChat · MxChatversion=0 <=2.5.5

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1213Data from Information Repositories

Public exploit references

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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