CVE-2021-31899Network attack vector

Authenticated code execution through read-only sessions

Published May 11, 2021 · Updated Aug 3, 2024

Authorization bypass in JetBrains CodeWithMe before 2021.1 allows remote authenticated users to execute code from read-only sessions. The read-only collaboration permission does not block a connected client from invoking code execution, although JetBrains has not disclosed the responsible check or code path. A client must first join a collaboration session with read-only access; exploitation crosses that role boundary and defeats the intended restriction.

CVSS severity8.8
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in JetBrains CodeWithMe before 2021.1 allows remote authenticated users to execute code from read-only sessions. The read-only collaboration permission does not block a connected client from invoking code execution, although JetBrains has not disclosed the responsible check or code path. A client must first join a collaboration session with read-only access; exploitation crosses that role boundary and defeats the intended restriction.

The record

CVE
CVE-2021-31899
Published
May 11, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

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Your stack

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