How severe is CVE-2017-7251?

CVE-2017-7251 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-2017-7251?

CVE-2017-7251 affects the following packages: pi/pi (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2017-7251?

Update pi/pi to 2.6.0-alpha1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-7251 is resolved across your whole dependency graph.

How do I detect CVE-2017-7251 in my Packagist dependencies?

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

How do I mitigate CVE-2017-7251 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-2017-7251 actively exploited in the wild?

No public exploit code has been indexed for CVE-2017-7251 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2017-7251?

CVE-2017-7251 has an EPSS (Exploit Prediction Scoring System) score of 1.0%, placing it in the 62th 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-2017-7251?

CVE-2017-7251 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.

When was CVE-2017-7251 published, and has it been updated?

CVE-2017-7251 was published on March 23, 2017 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-2017-7251 — pi

MEDIUMFix: pi-engine/pi@557cd05

CVE-2017-7251 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in pi/pi. A fix is available for pi/pi — see the affected versions and patch details below.

Pi Cross-site Scripting vulnerability

Also known asGHSA-9v3w-m552-m6ff

Published

Mar 23, 2017

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs62th percentile — riskier than 62% 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

🐘pi/pi

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

A Cross-Site Scripting (XSS) was discovered in pi-engine/pi 2.5.0. The vulnerability exists due to insufficient filtration of user-supplied data (preview) passed to the "pi-develop/www/script/editor/markitup/preview/markdown.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`pi/pi`	all versions	2.6.0-alpha1`composer require pi/pi:^2.6.0-alpha1`

Affected Products

1 product · 1 configurations

Application

pipiengine

≤ 2.5.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pi/pi, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update pi/pi to 2.6.0-alpha1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-7251 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.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2017-7251 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Mar 23, 2017

Last updated

Oct 20, 2026

Identifiers

CVE-2017-7251

GHSA-9v3w-m552-m6ff

References

Advisorysecurityfocus.com Advisorynvd.nist.gov · CVE 2017 7251 Fixgithub.com Webgithub.com · 557cd05b21b4d7fe422f90adcfa0c6e3bea06153 Webweb.archive.org Packagegithub.com · pi

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs with CWE-79 are rated as high or higher (top: high).

CVE-2026-126075CVE-2026-126063CVE-2026-110802CVE-2026-123364CVE-2026-118670CVE-2026-88986CVE-2026-63197CVE-2026-55649Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026