CVE-2025-44136: MapTiler Tileserver-php v2.0 is vulnerable to Cross Site Scripting (XSS)

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-44136 is a critical-severity flaw (CVSS 9.8) affecting tileserver php. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MapTiler Tileserver-php v2.0 is vulnerable to Cross Site Scripting (XSS). The GET parameter "layer" is reflected in an error message without html encoding. This leads to XSS and allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victim's browser.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-07-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: maptiler

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

Am I affected?

Timeline

2025-07-29 17:15 UTCPublished CVE record published
2026-06-17 09:24 UTCUpdated Record last modified

maptiler tileserver php DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy tileserver-php || rpm -q tileserver-php || tileserver-php --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison tileserver-php sudo apt install tileserver-php=<VERSION_BEFORE_2.0> sudo apt-mark hold tileserver-php

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tileserver-php sudo dnf downgrade tileserver-php-<VERSION_BEFORE_2.0> sudo dnf versionlock add tileserver-php

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · R · FIXED · 4.6.2-1.fc46 · FEDORA-2026-1dd919a262 · source

sudo dnf upgrade --advisory=FEDORA-2026-1dd919a262

Fedora ELN · perl-Mail-AuthenticationResults · FIXED · 2.20261029-1.eln159 · FEDORA-2026-a2c11d7da6 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2c11d7da6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: mheranco/CVE-2025-44136 (0 stars)
Write-up: github.com/maptiler/tileserver-php/issues/167
Nuclei scan template: MapTiler Tileserver-php v2.0 - Unauthenticated XSS

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-2025-44136?

tileserver php: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-44136 being exploited?

CVE-2025-44136 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-2025-44136 affect?

CVE-2025-44136 affects tileserver php. Severity is critical (CVSS 9.8). MapTiler Tileserver-php v2.0 is vulnerable to Cross Site Scripting (XSS). The GET parameter "layer" is reflected in an error message without html encoding. This leads to XSS and allows an unauthenticated attacker to execute arbitrary HTML o

How urgent is CVE-2025-44136?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-44137 HIGH 8.2 DOWNGRADE MapTiler Tileserver-php v2.0 is vulnerable to Directory Traversal

References

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