CVE-2020-27356Network attack vector

Stored XSS via unsanitized User-Agent

Published Dec 7, 2021 · Updated Aug 4, 2024

Cross-site scripting in Debug Meta Data 1.1.2 for WordPress allows remote authenticated users to execute arbitrary scripts via a crafted User-Agent header. The plugin stores the User-Agent value from a login request without sufficient input sanitization or output escaping, then renders it on profile.php. An attacker needs an account and a victim to visit the profile page; script execution can impersonate the victim and steal credentials.

CVSS severity3.5
Low
EPSS probability0.95%
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 Debug Meta Data 1.1.2 for WordPress allows remote authenticated users to execute arbitrary scripts via a crafted User-Agent header. The plugin stores the User-Agent value from a login request without sufficient input sanitization or output escaping, then renders it on profile.php. An attacker needs an account and a victim to visit the profile page; script execution can impersonate the victim and steal credentials.

The record

CVE
CVE-2020-27356
Published
Dec 7, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 7, 2021CVE 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

5.4[email protected]CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5[email protected]AV:N/AC:M/Au:S/C:N/I:P/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')
T1189Drive-by Compromise

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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