CVE-2020-8518Known exploitationPublic exploitNetwork attack vector

Code execution via unescaped CSV quote parameter

Published Feb 17, 2020 · Updated Aug 4, 2024

Code injection in Horde Groupware Webmail Edition 5.2.22 allows remote authenticated users to execute arbitrary PHP via CSV imports. Horde_Data Csv.php passes the user-controlled quote character into create_function after escaping apostrophes but not backslashes, letting input terminate the generated string and append executable PHP. Registered users can reach affected import pages by default; unauthenticated execution requires explicitly enabled guest access to a CSV-importing resource.

CVSS severity9.8
Critical
EPSS probability71.73%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Horde Groupware Webmail Edition 5.2.22 allows remote authenticated users to execute arbitrary PHP via CSV imports. Horde_Data Csv.php passes the user-controlled quote character into create_function after escaping apostrophes but not backslashes, letting input terminate the generated string and append executable PHP. Registered users can reach affected import pages by default; unauthenticated execution requires explicitly enabled guest access to a CSV-importing resource.

The record

CVE
CVE-2020-8518
Published
Feb 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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