XSS in Koajs Koa
CVE-2025-32379
Koa is expressive middleware for Node.js using ES2017 async functions. In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it, may execute javascript code on the user who use the app. This issue is patched in 2.16.1 and 3.0.0-alpha.5.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (15.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Koajs Koa — versions >= 3.0.0-alpha.0, < 3.0.0-alpha.5, 3.0.0, < 2.16.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/koajs/koa/security/advisories/GHSA-x2rg-q646-7m2v (Patch, Vendor Advisory)
- github.com/koajs/koa/commit/ff25eb4a7f2392df46481fe86355161067687312 (Patch)
Frequently asked questions
- What is CVE-2025-32379?
- CVE-2025-32379 is a medium-severity vulnerability in Koajs Koa, classified under Cross-site Scripting. CVSS score: 5.0/10. Published 2025-04-09.
- How severe is CVE-2025-32379?
- Medium severity. CVSS v3 base score is 5.0 out of 10.
- Is CVE-2025-32379 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.