CVE-2021-29435Network attack vector

Protected-data modification via misordered CSRF callback

Published Apr 13, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Trestle trestle-auth 0.4.0 through 0.4.1 allows remote attackers to alter protected data through an administrator's browser. The authentication controller prepends authentication callbacks ahead of Rails forgery protection, so a crafted form reaches authenticated actions before CSRF validation. An administrator with an active session must submit the attacker's form; successful requests can change protected records, including admin account credentials.

CVSS severity8.1
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Trestle trestle-auth 0.4.0 through 0.4.1 allows remote attackers to alter protected data through an administrator's browser. The authentication controller prepends authentication callbacks ahead of Rails forgery protection, so a crafted form reaches authenticated actions before CSRF validation. An administrator with an active session must submit the attacker's form; successful requests can change protected records, including admin account credentials.

The record

CVE
CVE-2021-29435
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Trestle
Product
trestle-auth
Classifications
CWE-352, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 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?

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

  1. Affected versionversion=>= 0.4.0, < 0.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Trestle · trestle-authversion=>= 0.4.0, < 0.4.2

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-352Cross-Site Request Forgery (CSRF)
T1204User Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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