How severe is CVE-2017-11516?

CVE-2017-11516 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-2017-11516?

CVE-2017-11516 affects the following packages: yiisoft/yii2-dev (Packagist), yiisoft/yii2 (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2017-11516?

Update yiisoft/yii2-dev to 2.0.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-11516 is resolved across your whole dependency graph.

How do I detect CVE-2017-11516 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yiisoft/yii2-dev, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2017-11516 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-2017-11516 actively exploited in the wild?

No public exploit code has been indexed for CVE-2017-11516 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-2017-11516?

CVE-2017-11516 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 58th 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-2017-11516?

CVE-2017-11516 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-2017-11516 published, and has it been updated?

CVE-2017-11516 was published on July 21, 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-2017-11516 — yii2-dev

MEDIUMFix: yiisoft/yii2#14492

CVE-2017-11516 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in yiisoft/yii2-dev. A fix is available for yiisoft/yii2-dev — see the affected versions and patch details below.

Yii Cross-site Scripting Framework vulnerability

Also known asGHSA-4c64-w8fg-xcq2

Published

Jul 21, 2017

Updated

Oct 20, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs58th percentile — riskier than 58% 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

2 pkgs affected

🐘yiisoft/yii2-dev🐘yiisoft/yii2

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

An XSS vulnerability exists in framework/views/errorHandler/exception.php in Yii Framework 2.0.12 affecting the exception screen when debug mode is enabled, because $exception->errorInfo is mishandled.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`yiisoft/yii2-dev`	≥ 2.0.12&&< 2.0.13	2.0.13`composer require yiisoft/yii2-dev:^2.0.13`
🐘Packagist	`yiisoft/yii2`	≥ 2.0.12&&< 2.0.13	2.0.13`composer require yiisoft/yii2:^2.0.13`

Affected Products

1 product · 1 configurations

Application

yiiyiiframework

1 version

2.0.12

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yiisoft/yii2-dev, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update yiisoft/yii2-dev to 2.0.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-11516 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-2017-11516 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:3.0/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.

OpenSSF Scorecard

Package health score

yii2

7.3/10

Dependency-Update-Tool10/10

Maintained10/10

Code-Review10/10

Vulnerabilities10/10

Branch-Protection3/10

Assessed Nov 7, 2026

Timeline

Disclosed

Jul 21, 2017

Last updated

Oct 20, 2026

Identifiers

CVE-2017-11516

GHSA-4c64-w8fg-xcq2

References

Advisorynvd.nist.gov · CVE 2017 11516 Fixgithub.com Fixgithub.com · feb4067de8a58f391a66e395192b0d83a8109b95 Packagegithub.com · yii2 framework

Related vulnerabilities

Also affects yiisoft/yii2-dev

This CVE is medium severity; 6 of 6 other CVEs affecting yiisoft/yii2-dev are rated as high or higher (top: critical).

CVE-2025-2689CVE-2018-7269CVE-2018-8074CVE-2018-6009CVE-2021-3689CVE-2021-3692

Also affects yiisoft/yii2

This CVE is medium severity; 2 of 2 other CVEs affecting yiisoft/yii2 are rated as high or higher (top: critical).

CVE-2026-39850CVE-2024-58136

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026