CVE-2021-32683Network attack vector

Account takeover via unchecked image blob MIME type

Published Jun 15, 2021 · Updated Aug 3, 2024

Cross-site scripting in Wire Web App before 2021-06-01-production.0 allows remote attackers to take over accounts through crafted images. The image asset component passed downloaded blobs to URL.createObjectURL without checking MIME type, allowing HTML payloads to run on app.wire.com. Exploitation requires a user to open the image in a new tab or paste its URL into the address bar, after which the attacker gains full control of that account.

CVSS severity8.8
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Wire Web App before 2021-06-01-production.0 allows remote attackers to take over accounts through crafted images. The image asset component passed downloaded blobs to URL.createObjectURL without checking MIME type, allowing HTML payloads to run on app.wire.com. Exploitation requires a user to open the image in a new tab or paste its URL into the address bar, after which the attacker gains full control of that account.

The record

CVE
CVE-2021-32683
Published
Jun 15, 2021
Updated
Aug 3, 2024
Vendor
Wire Swiss GmbH
Product
Wire Web App
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 2021-06-01-production.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wire Swiss GmbH · Wire Web Appversion=< 2021-06-01-production.0

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo