CVE-2026-44587Public exploitNetwork attack vector

Stored XSS via unescaped denylist regex entries

Published Jun 16, 2026 · Updated Jun 16, 2026

Stored XSS in CarrierWave before 2.2.7 and 3.0.0.rc through 3.1.2 allows remote attackers to execute script through uploaded SVG files. The content_type_denylist method interpolates string entries into a regular expression without escaping metacharacters, so image/svg+xml fails to match its literal MIME type. Exploitation requires an application to use that denylist, accept the crafted upload, serve it inline from its origin, and have a victim view the file.

CVSS severity4.7
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in CarrierWave before 2.2.7 and 3.0.0.rc through 3.1.2 allows remote attackers to execute script through uploaded SVG files. The content_type_denylist method interpolates string entries into a regular expression without escaping metacharacters, so image/svg+xml fails to match its literal MIME type. Exploitation requires an application to use that denylist, accept the crafted upload, serve it inline from its origin, and have a victim view the file.

The record

CVE
CVE-2026-44587
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
CarrierWave
Product
CarrierWave
Classifications
CWE-184, CWE-79, CWE-625, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.2.7
  2. Affected versionversion=>= 3.0.0.rc, < 3.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CarrierWave · CarrierWaveversion=< 2.2.7; version=>= 3.0.0.rc, < 3.1.3

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-625Permissive Regular Expression
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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