CVE-2024-2596Network attack vector

Session-cookie theft via unencoded request parameters

Published Mar 18, 2024 · Updated Aug 21, 2024

Cross-site scripting in Amssplus AMSS++ 4.31 allows remote attackers to steal authenticated users' session cookies via crafted URLs. The select_send.php handler under /amssplus/modules/mail/main/ fails to sufficiently encode multiple user-controlled parameters before rendering them. Exploitation requires an authenticated user to open the crafted link, after which injected script can read and exfiltrate that user's session cookie.

CVSS severity7.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Amssplus AMSS++ 4.31 allows remote attackers to steal authenticated users' session cookies via crafted URLs. The select_send.php handler under /amssplus/modules/mail/main/ fails to sufficiently encode multiple user-controlled parameters before rendering them. Exploitation requires an authenticated user to open the crafted link, after which injected script can read and exfiltrate that user's session cookie.

The record

CVE
CVE-2024-2596
Published
Mar 18, 2024
Updated
Aug 21, 2024
Vendor
Amssplus
Product
AMSS++
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2024Record 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=4.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amssplus · AMSS++version=4.31

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.1Spanish National Cybersecurity Institute, S.A. (INCIBE)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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