CVE-2021-29625Public exploitNetwork attack vector

Cross-site scripting via unescaped documentation link

Published May 19, 2021 · Updated Aug 3, 2024

Cross-site scripting in Adminer 4.7.8 through 4.8.0 allows remote attackers to execute script in a user's browser via a crafted table parameter. The doc_link function concatenates an unescaped database-documentation URL and path into an href attribute, allowing the table value to break out of that attribute. Exploitation requires user interaction and either PDO warning output that prevents the CSP header or a browser without strict CSP; successful script runs in the Adminer origin.

CVSS severity7.5
High
EPSS probability9.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Adminer 4.7.8 through 4.8.0 allows remote attackers to execute script in a user's browser via a crafted table parameter. The doc_link function concatenates an unescaped database-documentation URL and path into an href attribute, allowing the table value to break out of that attribute. Exploitation requires user interaction and either PDO warning output that prevents the CSP header or a browser without strict CSP; successful script runs in the Adminer origin.

The record

CVE
CVE-2021-29625
Published
May 19, 2021
Updated
Aug 3, 2024
Vendor
Adminer
Product
Adminer
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.7.8, < 4.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adminer · Adminerversion=>= 4.7.8, < 4.8.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo