CVE-2025-31131 is a high-severity (CVSS 8.6) Path Traversal vulnerability in yeswiki/yeswiki. 1 public exploit reference exists, so weaponization risk is real. A fix is available for yeswiki/yeswiki — see the affected versions and patch details below.
Path Traversal allowing arbitrary read of files in Yeswiki
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-31131.
EPSS Exploitation Probability
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.
How urgent is this, really
CVE-2025-31131 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
yeswiki/yeswikiReal-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
The squelette parameter is vulnerable to path traversal attacks, enabling read access to arbitrary files on the server. The payload ../../../../../../etc/passwd was submitted in the squelette parameter. The requested file was returned in the application's response.
Details
File path traversal vulnerabilities arise when user-controllable data is used within a filesystem operation in an unsafe manner. Typically, a user-supplied filename is appended to a directory prefix in order to read or write the contents of a file. If vulnerable, an attacker can supply path traversal sequences (using dot-dot-slash characters) to break out of the intended directory and read or write files elsewhere on the filesystem.
PoC
-
Access the below URL to see the contents of
/etc/passwd: URL with payload:https://yeswiki.net/?UrkCEO/edit&theme=margot&squelette=..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd&style=margot.cssSimilarly, contents of
wakka.config.phpcan be read (which contains database password) using..%2f..%2f..%2fwakka.config.phpas payload. Thus showing the severity of this issue.
Impact
This is a very serious vulnerability, allowing an attacker to access sensitive files containing configuration data, passwords, database records, log data, source code, and program scripts and binaries. Thus, leading to complete loss of confidentiality.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | yeswiki/yeswiki | all versions | 4.5.2composer require yeswiki/yeswiki:^4.5.2 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
YesWiki 4.5.1 - Unauthenticated Path Traversal
by Al Baradi Joy · Apr 7, 2025
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yeswiki/yeswiki, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update yeswiki/yeswiki to 4.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-31131 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2025-31131 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2025-31131. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2025-31131
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2025-31131 -u https://target- Template
- Yeswiki < 4.5.2 - Unauthenticated Path Traversal
- Severity
- high
- Impact
- Unauthenticated attackers can exploit path traversal through the squelette parameter to read arbitrary files from the YesWiki server, potentially exposing sensitive configuration and data files.
- Remediation
- This vulnerability is fixed in 4.5.2.
Template by ProjectDiscovery nuclei-templates (iamnoooob, rootxharsh, pdresearch), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2025-31131 in your dependencies?
O3 Security finds CVE-2025-31131 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.