4.7

CVE-2026-44581: vercel next.js Cross-site Scripting

CVSS: 4.7v3.1MediumAnalyzed
AliasesGHSA-ffhc-5mcf-pf4qCGA-2925-phmf-x9gjCGA-2hcj-7jwp-pvxv
Published 13-05-2026Last modified 18-05-2026
Open JSON

Vulnerability summary

CVE-2026-44581 is a medium (CVSS 4.7) Cross-site Scripting vulnerability in vercel next.js. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.1% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.7/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-WRQ4-VJJV-9RGR

Timeline

  1. 13-05-2026
    PublishedVulnerability first disclosed.
  2. 18-05-2026
    Last modifiedVulnerability information updated.

Description

Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution for later visitors. This vulnerability is fixed in 15.5.16 and 16.2.5.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

+0.03 pp

From 0.22% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard4 products
  • cadence-webAll versions (No fix recorded)
  • commercial-chainloop-frontendAll versions (No fix recorded)
  • keep-ui< 0.51.0-r7
  • langfuse-fips-3.152All versions (No fix recorded)
Npm1 product
  • next≥ 13.4.0, < 15.5.16 | ≥ 16.0.0, < 16.2.5
Vercel1 product
  • next.js≥ 13.4.0, < 15.5.16 | ≥ 16.0.0, < 16.2.5

3 vendors · 6 products

References

6 links