How severe is CVE-2021-29625?

CVE-2021-29625 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-29625?

CVE-2021-29625 affects the following packages: vrana/adminer (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2021-29625?

Update vrana/adminer to 4.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-29625 is resolved across your whole dependency graph.

How do I detect CVE-2021-29625 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for vrana/adminer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-29625 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2021-29625 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2021-29625, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-29625?

CVE-2021-29625 has an EPSS (Exploit Prediction Scoring System) score of 9.6%, placing it in the 96th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-29625?

CVE-2021-29625 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Is there exploit tooling available for CVE-2021-29625?

A Nuclei detection template exists for CVE-2021-29625, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2021-29625 published, and has it been updated?

CVE-2021-29625 was published on May 19, 2021 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2021-29625 — adminer

MEDIUMFix: vrana/adminer@4043092

CVE-2021-29625 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in vrana/adminer. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for vrana/adminer — see the affected versions and patch details below.

XSS in doc_link

Also known asGHSA-2v82-5746-vwqc

Published

May 19, 2021

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

9.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs96th percentile — riskier than 96% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘vrana/adminer

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Users of MySQL, MariaDB, PgSQL and SQLite are affected. XSS is in most cases prevented by strict CSP in all modern browsers. The only exception is when Adminer is using a pdo_ extension to communicate with the database (it is used if the native extensions are not enabled). In browsers without CSP, Adminer versions 4.6.1 to 4.8.0 are affected.

Patches

Patched by 4043092, included in version 4.8.1.

Workarounds

Do both:

Use browser supporting strict CSP.
Enable the native PHP extensions (e.g. mysqli) or disable displaying PHP errors (display_errors).

References

https://sourceforge.net/p/adminer/bugs-and-features/797/

For more information

If you have any questions or comments about this advisory:

Comment at 4043092.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`vrana/adminer`	≥ 4.7.8&&< 4.8.1	4.8.1`composer require vrana/adminer:^4.8.1`

Affected Products

1 product · 1 configurations

Application

admineradminer

≥ 4.6.1 && < 4.8.1

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Adminer is open-source database management software. A cross-site script…

sourceforge.netNVDMay 2021

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for vrana/adminer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update vrana/adminer to 4.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-29625 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

How to detect CVE-2021-29625

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2021-29625 -u https://target

Template: Adminer <=4.8.0 - Cross-Site Scripting
Severity: medium
Impact: Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the Adminer interface, potentially leading to session hijacking, defacement, or theft of sensitive information.
Remediation: This vulnerability is patched in version 4.8.1. As workarounds, one can use a browser supporting strict CSP or enable the native PHP extensions (e.g. `mysqli`) or disable displaying PHP errors (`display_errors`).

Template by ProjectDiscovery nuclei-templates (daffainfo), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

### Impact Users of MySQL, MariaDB, PgSQL and SQLite are affected. XSS is in most cases prevented by strict CSP in all modern browsers. The only exception is when Adminer is using a `pdo_` extension to communicate with the database (it is used if the native extensions are not enabled). In browsers without CSP, Adminer versions 4.6.1 to 4.8.0 are affected. ### Patches Patched by 4043092, included in version [4.8.1](https://github.com/vrana/adminer/releases/tag/v4.8.1). ### Workarounds Do both: * Use browser supporting strict CSP. * Enable the native PHP extensions (e.g. `mysqli`) or disable d