CVE-2020-1771Network attack vector

Stored XSS via unencoded address-book link parameters

Published Mar 27, 2020 · Updated Sep 17, 2024

Stored XSS in OTRS allows remote authenticated users to execute JavaScript in an agent's browser via a crafted customer address-book link. Article content can embed an address-book link whose parameters are inserted into the resulting page without encoding, causing script syntax to be interpreted instead of rendered as data. Creating the article requires authenticated access, and execution requires an agent to open the link; OTRS 7.0.15 and earlier and ((OTRS)) Community Edition 6.0.26 and earlier are affected.

CVSS severity4.6
Medium
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OTRS allows remote authenticated users to execute JavaScript in an agent's browser via a crafted customer address-book link. Article content can embed an address-book link whose parameters are inserted into the resulting page without encoding, causing script syntax to be interpreted instead of rendered as data. Creating the article requires authenticated access, and execution requires an agent to open the link; OTRS 7.0.15 and earlier and ((OTRS)) Community Edition 6.0.26 and earlier are affected.

The record

CVE
CVE-2020-1771
Published
Mar 27, 2020
Updated
Sep 17, 2024
Vendor
OTRS AG
Product
OTRS
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=7.0.x <=7.0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OTRS AG · OTRSversion=7.0.x <=7.0.15
OTRS AG · ((OTRS)) Community Editionversion=6.0.x <=6.0.26

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.6OTRS AGCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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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