CVE-2026-44581 (GCVE-0-2026-44581)

Vulnerability from cvelistv5 – Published: 2026-05-13 17:07 – Updated: 2026-05-13 17:07
VLAI?
Title
Next.js: Cross-site scripting in App Router applications using CSP nonces
Summary
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.
Severity ?
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
vercel next.js Affected: >= 13.4.0, < 15.5.16
Affected: >= 16.0.0, < 16.2.5
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          "versions": [
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            },
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        }
      ],
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            "attackVector": "NETWORK",
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            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
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            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
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          }
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      "problemTypes": [
        {
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              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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            }
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        "discovery": "UNKNOWN"
      },
      "title": "Next.js: Cross-site scripting in App Router applications using CSP nonces"
    }
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    "dateReserved": "2026-05-06T21:49:12.424Z",
    "dateUpdated": "2026-05-13T17:07:15.845Z",
    "state": "PUBLISHED"
  },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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