CVE-2025-27088: oxyno-zeta/s3-proxy is an aws s3 proxy written in go

Q: How do I fix CVE-2025-27088?

s3-proxy: upgrade to 2.23.1; s3-proxy: upgrade to 4.18.1; s3-proxy: upgrade to 4.18.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-27088 being exploited?

CVE-2025-27088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-27088 affect?

CVE-2025-27088 affects s3-proxy, s3-proxy, s3-proxy. Severity is high (CVSS 8.2). oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can

Q: How urgent is CVE-2025-27088?

Priority 49/100. High severity; Public exploit reference; On your watchlist

This month

HIGH 8.2WATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2025-27088 is a high-severity flaw (CVSS 8.2) affecting s3-proxy, s3-proxy, s3-proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can lead to session hijacking or phishing attacks on a trusted domain, posing a moderate risk to all users. It's possible to inject html elements, including scripts through the folder-list template. The affected t

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-02-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: oxyno-zeta

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-02-20 23:15 UTCPublished CVE record published
2026-06-17 09:03 UTCUpdated Record last modified

oxyno-zeta s3-proxy UPGRADE

Affected: < 2.23.1

Fixed in: 2.23.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy s3-proxy || rpm -q s3-proxy || s3-proxy --version

2. UPGRADE to 2.23.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade s3-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade s3-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

oxyno-zeta s3-proxy UPGRADE

Affected: < 4.18.1

Fixed in: 4.18.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy s3-proxy || rpm -q s3-proxy || s3-proxy --version

2. UPGRADE to 4.18.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade s3-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade s3-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

oxyno-zeta s3-proxy UPGRADE

Affected: < 4.18.1

Fixed in: 4.18.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy s3-proxy || rpm -q s3-proxy || s3-proxy --version

2. UPGRADE to 4.18.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade s3-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade s3-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-27088?

s3-proxy: upgrade to 2.23.1; s3-proxy: upgrade to 4.18.1; s3-proxy: upgrade to 4.18.1. Exact commands for each OS are on this page.

Is CVE-2025-27088 being exploited?

CVE-2025-27088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-27088 affect?

CVE-2025-27088 affects s3-proxy, s3-proxy, s3-proxy. Severity is high (CVSS 8.2). oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can

How urgent is CVE-2025-27088?

Priority 49/100. High severity; Public exploit reference; On your watchlist

Software pages

AWS vulnerabilities

References

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