Security Digest · Vulnerability record
CVE-2025-46348: YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download
YesWiki is a wiki system written in PHP. Prior to version 4.5.4, the request to commence a site backup can be performed and downloaded without authentication.
CVSS 10.0 Critical EPSS 0.7% · p51
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.7%, percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
yeswiki/yeswiki(Composer (PHP)) <= 4.5.3, fixed in 4.5.4. Check your lockfile, including transitive dependencies.
What it is
YesWiki is a wiki system written in PHP. Prior to version 4.5.4, the request to commence a site backup can be performed and downloaded without authentication. The archives are created with a predictable filename, so a malicious user could create and download an archive without being authenticated. This could result in a malicious attacker making numerous requests to create archives and fill up the file system, or by downloading the archive which contains sensitive site information. This issue has been patched in version 4.5.4.
From the GitHub advisory
Summary
The request to commence a site backup can be performed without authentication. Then these backups can also be downloaded without authentication.
The archives are created with a predictable filename, so a malicious user could create an archive and then download the archive without being authenticated.
Details
Create an installation using the instructions found in the docker folder of the repository, setup the site, and then send the request to create an archive, which you do not need to be authenticated for:
Weakness type: CWE-287, CWE-862.
Product: yeswiki/yeswiki (Composer (PHP)) · Assigned by: GitHub_M · Published: 2025-04-29
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Composer (PHP) | yeswiki/yeswiki | <= 4.5.3 | 4.5.4 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| YesWiki | yeswiki | < 4.5.4 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 10 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 51.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-wc9g-6j9w-hr95 published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-wc9g-6j9w-hr95 github.com
- CVE.org record CVE-2025-46348 cve.org
- NVD entry CVE-2025-46348 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
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